Adjective
1. a. Of or relating to commerce: a commercial loan; a commercial attaché.
b. Engaged in commerce: a commercial trucker.
c. Involved in work that is intended for the mass market: a commercial artist.
2. Of, relating to, or being goods, often unrefined, produced and distributed in large quantities for use by industry.
3. Having profit as a chief aim: a commercial book, not a scholarly tome.
4. Sponsored by an advertiser or supported by advertising: commercial television.
THAT should narrow down your definition of commercial music

A DJ's goal in his/her gig should take a crowd on a journey through his CD case and and how he mixes, that defines his/her style. So whatever you call the tracks he/she plays , you're judging his/her style which is his/her way of taking you into a Trance. So it really depends on the DJ AND how you cooperate with him in listening and dancing to the music he/she plays because you can jst be all stubborn and call everything he plays commercial/underground and say you didnt like it. Finally, you cannot really judge his tracklist until you listen to it because there's the mixing factor missing.

I know this is besides the point but, Danjo told me that he wanted to try tracks since the crowd was shitty and uncooperative.