[scns]

TL; DR: Music quality > Sound quality for me.

One DJ, Errorhead IIRC, recorded a track from a taxis stereo in colombia, crowd goes bonkers every time he plays it. I once had a DJ spinnin vinyl bore me to death, made me sad to think about how much he spent for those records. I much rather have bangin tunes in mp3 than that. Physically there might be a difference, mp3 filtering out stuff you "can't hear". Should affect the deep bass you can only hear and feel on a clubs PA.

I discovered awesome music in the worst quality you could imagine, midi files via a cheap soundcard. Even with plastic guitars, Led Zeppelin still sounds awesome.