Physical Heavensward OST instead of itunes?

[Laraul]

Does iTunes use some form of DRM on their music?

No...

I have an intense dislike for iTunes and its proprietary system, so I buy all of my MP3s from either Amazon or Google.

iTunes doesn't use a proprietary system. All files are encoded in AAC and can easily be re-encoded to whatever format you wish (MP3, WMA, OGG, etc).