45 years ago when our small group 'got into audio', we soon started to use classical music. NOT because we liked the music (NOT), but because all the modern music was CRAP, recoreded/mixed/molested to death with their umptieth track and gazillion mics, and uterly useless to 'test' equipment. The sound engineers for classical music on the other hand had already decades of experience how to record and preserve music the right way.
Today, I put Steely Dan, Friday Night in San Francisco, Frank Zappa, Dire Straits, Pink Floyd (45 years of using it, the one constant), Yello, Flight of the Cosmic Hippo (lets see what is shaking), Driver's Seat (not sure why, just snappy) in the CD player.