Half-decent mastering engineer, with some of the highest-quality audio on YouTube. Much of my [unofficial] remastering work is featured herein (though not everything here is stuff that I've worked on personally)…
My philosophy is simple: Make the music sound better — NOT louder... The so-called "Loudness War" can f**k right off, along with all the proponents of it!
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More info about the "Loudness War" (and the damaging effect it's having on music) here: en.wikipedia.org/wiki/Loudness_war
DR = "Dynamic Range" (i.e. the difference between the loudest and quietest parts of a signal, typically measured in decibels). The higher the Dynamic Range, the better and more natural the recording tends to sound.