Mattias Holmgren

@UCPI1x2iyASeNaeRYVSGXTqA - 63.6K subscribers

What happens when a pro composer hears your favorite game music? I’m Mattias Holmgren (aka Gelhein), a Swedish producer and designer with 25+ years of industry experience. On this channel, I take deep-dive reactions into Game OSTs, breaking down the composition, sound design, and emotional impact from a professional perspective. Beyond the music, I’m here to guide YOU in music production and creativity. I share the tricks I’ve learned over two decades to help the next generation of creative producers. 🚀 Grab my FREE Creative Booster Guide: www.morningdewmedia.com 📬 Business Inquiries: [email protected] Join me at the intersection of games, music, and design. Subscribe for a deeper look at the sounds you love!

Home Videos Live Playlists

Hollow Knight OST: The Evolution Of Christopher Larkin (Composer Reaction)

Hollow Knight OST: The Evolution Of Christopher Larkin (Composer Reaction) Mattias Holmgren

10.8K views - 6 days ago

PHANTOM is Silksong's most underrated boss! (Full Fight)

PHANTOM is Silksong's most underrated boss! (Full Fight) Mattias Holmgren

1K views - 1 week ago

Monster Hunter World: Fatalis is TERRIFYING | Composer Reacts to Fatalis Medley

Monster Hunter World: Fatalis is TERRIFYING | Composer Reacts to Fatalis Medley Mattias Holmgren

8.8K views - 2 weeks ago

Outer Wilds: Timber Hearth sounds like coming home (composer reacts)

Outer Wilds: Timber Hearth sounds like coming home (composer reacts) Mattias Holmgren

1.1K views - 3 weeks ago

Listening to Expedition 33 as a father broke me | A Deeply Personal Reflection

Listening to Expedition 33 as a father broke me | A Deeply Personal Reflection Mattias Holmgren

20.7K views - 4 weeks ago

TONEX Pedal Bass Edition Review (Machine Modeling Bass Amps & Stompboxes)

TONEX Pedal Bass Edition Review (Machine Modeling Bass Amps & Stompboxes) Mattias Holmgren

805 views - 4 weeks ago

Metal Gear Solid 4: "Old Snake" | COMPOSER REACTION

Metal Gear Solid 4: "Old Snake" | COMPOSER REACTION Mattias Holmgren

951 views - 1 month ago

Reacting to the wildest EDM-Opera fusion in gaming history (Clair Obscur: Expedition 33)

Reacting to the wildest EDM-Opera fusion in gaming history (Clair Obscur: Expedition 33) Mattias Holmgren

2.7K views - 1 month ago

The TGA 2025 Orchestra still gives me chills (Silksong, Expedition 33, DS2)

The TGA 2025 Orchestra still gives me chills (Silksong, Expedition 33, DS2) Mattias Holmgren

2.2K views - 1 month ago

Nightreign's OST is Mastery. My Top 3 Boss Tracks Ranked

Nightreign's OST is Mastery. My Top 3 Boss Tracks Ranked Mattias Holmgren

4.4K views - 1 month ago

Composer Reacts: Beast Clergyman Boss Theme (All Phases) Elden Ring OST

Composer Reacts: Beast Clergyman Boss Theme (All Phases) Elden Ring OST Mattias Holmgren

1.4K views - 1 month ago

I'm OBSESSED with "Time to Swim Swim" | Clair Obscur Reaction & piano solo

I'm OBSESSED with "Time to Swim Swim" | Clair Obscur Reaction & piano solo Mattias Holmgren

2.8K views - 2 months ago

I sat down at the piano to relax. This is what happened. (Osmose)

I sat down at the piano to relax. This is what happened. (Osmose) Mattias Holmgren

566 views - 2 months ago

Christopher Larkin Did It Again! Moss Grotto (Silksong OST) Analysis

Christopher Larkin Did It Again! Moss Grotto (Silksong OST) Analysis Mattias Holmgren

767 views - 2 months ago

Xenoblade 2's Leftherian Archipelago HIT ME HARD! 😭

Xenoblade 2's Leftherian Archipelago HIT ME HARD! 😭 Mattias Holmgren

1.9K views - 2 months ago

FFXIII "Nascent Requiem" is BEYOND EPIC (Composer Reaction & Light Analysis)

FFXIII "Nascent Requiem" is BEYOND EPIC (Composer Reaction & Light Analysis) Mattias Holmgren

853 views - 2 months ago

Composer is STUNNED by the Melody of Nyleth (Silksong OST)

Composer is STUNNED by the Melody of Nyleth (Silksong OST) Mattias Holmgren

3.1K views - 2 months ago

Lies Of P: Shadow Flower, as beautiful as Clair Obscur (composer reaction)

Lies Of P: Shadow Flower, as beautiful as Clair Obscur (composer reaction) Mattias Holmgren

1.7K views - 3 months ago

Composer Reacts: Emil / Sacrifice (NieR: Replicant)

Composer Reacts: Emil / Sacrifice (NieR: Replicant) Mattias Holmgren

3.1K views - 3 months ago

Film Scoring for Beginners: From Zero to Cinematic

Film Scoring for Beginners: From Zero to Cinematic Mattias Holmgren

664 views - 3 months ago

Clair Obscur: Aux Lendemains non Écrits Broke My Heart (Composer Reacts)

Clair Obscur: Aux Lendemains non Écrits Broke My Heart (Composer Reacts) Mattias Holmgren

22.8K views - 3 months ago

Outer Wilds OST - Echoes of Time & Space (Composer Reacts)

Outer Wilds OST - Echoes of Time & Space (Composer Reacts) Mattias Holmgren

6.6K views - 3 months ago

Donner L1 Synth: Real Analog SH-101 Clone That’s Beginner-Friendly

Donner L1 Synth: Real Analog SH-101 Clone That’s Beginner-Friendly Mattias Holmgren

3.1K views - 3 months ago

I Was NOT Ready For Ori and the Blind Forest OST (Composer Reacts)

I Was NOT Ready For Ori and the Blind Forest OST (Composer Reacts) Mattias Holmgren

3.4K views - 3 months ago

Cogwork Core is BRILLIANT! (Composer reacts to Silksong)

Cogwork Core is BRILLIANT! (Composer reacts to Silksong) Mattias Holmgren

4.1K views - 3 months ago

Wait… Did Clair Obscure Borrow Nier’s Grandma Theme (reaction)

Wait… Did Clair Obscure Borrow Nier’s Grandma Theme (reaction) Mattias Holmgren

2.5K views - 3 months ago

Clair Obscur: Tic Tacs with Alice (Musician reacts + piano breakdown)

Clair Obscur: Tic Tacs with Alice (Musician reacts + piano breakdown) Mattias Holmgren

3.4K views - 4 months ago

Silksong’s Lace Boss Music Made Me Lose It

Silksong’s Lace Boss Music Made Me Lose It Mattias Holmgren

5.2K views - 4 months ago

Who Should Win GOTY Soundtrack 2025 (My Take)

Who Should Win GOTY Soundtrack 2025 (My Take) Mattias Holmgren

12K views - 4 months ago

MEGABONK’s Wild Soundtrack (Composer Reacts)

MEGABONK’s Wild Soundtrack (Composer Reacts) Mattias Holmgren

2K views - 4 months ago

Clair Obscur (Lumière) Reimagined with Augmented Choirs by UVI

Clair Obscur (Lumière) Reimagined with Augmented Choirs by UVI Mattias Holmgren

2.4K views - 4 months ago

Cinematic String Articulations Made Simple (With Free Libraries)

Cinematic String Articulations Made Simple (With Free Libraries) Mattias Holmgren

660 views - 4 months ago

Composer Reacts to NieR: Automata’s City Ruins (Music Breakdown)

Composer Reacts to NieR: Automata’s City Ruins (Music Breakdown) Mattias Holmgren

3.3K views - 4 months ago

I Was NOT ready for this! Composer reacts to Clair Obscur: Une vie à rêver

I Was NOT ready for this! Composer reacts to Clair Obscur: Une vie à rêver Mattias Holmgren

18.3K views - 4 months ago

This track blew me AWAY (Composer reacts to Clair Obscur: Une vie à peindre) GOTY 2025?

This track blew me AWAY (Composer reacts to Clair Obscur: Une vie à peindre) GOTY 2025? Mattias Holmgren

31.9K views - 4 months ago

Silksong’s Theme Is a Melodic Masterpiece (Musician Reacts to Silksong)

Silksong’s Theme Is a Melodic Masterpiece (Musician Reacts to Silksong) Mattias Holmgren

3.1K views - 5 months ago

Lampmaster Boss Theme: MASSIVE Perfection | Composer Reacts

Lampmaster Boss Theme: MASSIVE Perfection | Composer Reacts Mattias Holmgren

17.5K views - 5 months ago

iLoud Precision 6 mk2: My Room Finally Sounds Like a Pro Studio

iLoud Precision 6 mk2: My Room Finally Sounds Like a Pro Studio Mattias Holmgren

2.8K views - 5 months ago

Clair Obscur: Alicia AMAZING Live at Zevent 2025 (Composer Reaction)

Clair Obscur: Alicia AMAZING Live at Zevent 2025 (Composer Reaction) Mattias Holmgren

28K views - 5 months ago

Gustave’s Melody, Rearranged – Clair Obscur’s Most Tender Theme

Gustave’s Melody, Rearranged – Clair Obscur’s Most Tender Theme Mattias Holmgren

6.2K views - 5 months ago

Clair Obscur: Aline Broke My Heart (Composer Reacts)

Clair Obscur: Aline Broke My Heart (Composer Reacts) Mattias Holmgren

70.6K views - 5 months ago

Clair Obscur: Monoco’s Unexpected Brilliance (Composer Reacts)

Clair Obscur: Monoco’s Unexpected Brilliance (Composer Reacts) Mattias Holmgren

20.6K views - 5 months ago

Clair Obscur: Alicia’s Song Broke Me (Composer Reacts)

Clair Obscur: Alicia’s Song Broke Me (Composer Reacts) Mattias Holmgren

191.5K views - 5 months ago

Clair Obscur: What if Hans Zimmer scored the Battle Theme? 😅

Clair Obscur: What if Hans Zimmer scored the Battle Theme? 😅 Mattias Holmgren

7K views - 5 months ago

Clair Obscur: Une vie à t'aimer - The Most Haunting Love Theme? (Composer Reacts)

Clair Obscur: Une vie à t'aimer - The Most Haunting Love Theme? (Composer Reacts) Mattias Holmgren

109.8K views - 5 months ago

Clair Obscur: Lumière - I Was NOT Ready For This (Composer Reacts)

Clair Obscur: Lumière - I Was NOT Ready For This (Composer Reacts) Mattias Holmgren

95.7K views - 5 months ago

Serum 2 Cinematic Preset Pack – ATLANTIA (MPE & Poly Aftertouch Demo)

Serum 2 Cinematic Preset Pack – ATLANTIA (MPE & Poly Aftertouch Demo) Mattias Holmgren

1.4K views - 5 months ago

Reaper 2025 – I Was NOT Expecting This!

Reaper 2025 – I Was NOT Expecting This! Mattias Holmgren

28.3K views - 6 months ago

Convert Audio to MIDI in Logic Pro (and Any DAW!) – Easy Tutorial

Convert Audio to MIDI in Logic Pro (and Any DAW!) – Easy Tutorial Mattias Holmgren

5K views - 6 months ago

Xkey Air 37: WEIRDEST Portable MIDI Keyboard?! Review, bluetooth test

Xkey Air 37: WEIRDEST Portable MIDI Keyboard?! Review, bluetooth test Mattias Holmgren

7.4K views - 6 months ago

Lagoon Chill - Live Electronic Session (Novation Summit & Roto Control)

Lagoon Chill - Live Electronic Session (Novation Summit & Roto Control) Mattias Holmgren

683 views - 6 months ago

Don’t Sleep on These Logic Pro Synths 💎

Don’t Sleep on These Logic Pro Synths 💎 Mattias Holmgren

5.5K views - 6 months ago

How I Mixed 'Coastal Bloom' Cinematic Post-Rock in Logic Pro

How I Mixed 'Coastal Bloom' Cinematic Post-Rock in Logic Pro Mattias Holmgren

557 views - 6 months ago

🎻 The Most EXPRESSIVE Strings Ever? Meet SOLISTE!

🎻 The Most EXPRESSIVE Strings Ever? Meet SOLISTE! Mattias Holmgren

2.3K views - 6 months ago

The First AI Band is Going Viral — Should We Be Worried?

The First AI Band is Going Viral — Should We Be Worried? Mattias Holmgren

3.1K views - 7 months ago

Scoring Sci-Fi Made EASY – Tricks Every Composer Should Know

Scoring Sci-Fi Made EASY – Tricks Every Composer Should Know Mattias Holmgren

1.7K views - 7 months ago

You Won’t believe What’s in Logic Pro 11.2!

You Won’t believe What’s in Logic Pro 11.2! Mattias Holmgren

1.2K views - 7 months ago

5 Reverb Hacks to Transform Your Sound — with UVI Bloom

5 Reverb Hacks to Transform Your Sound — with UVI Bloom Mattias Holmgren

932 views - 7 months ago

Mixing Has Never Been This Fun! ROTO CONTROL + Bitwig Studio (Full Review)

Mixing Has Never Been This Fun! ROTO CONTROL + Bitwig Studio (Full Review) Mattias Holmgren

8.2K views - 7 months ago

The ultimate plugin hardware controller💪🎹

The ultimate plugin hardware controller💪🎹 Mattias Holmgren

976 views - 8 months ago