My typical audition torture tracks also include tracks from Rush (particularly their later more synthesized material), Massive Attack (for the bass), Eric Clapton (maybe 'cause I know the tracks so well), and Blue Oyster Cult (Vengance from F.O.U.O. is a good one). I also have some Metallica albums, but I just don't think they are that dynamic (don't flame me).

But there is something about orchestral music that rock just doesn't have: as many instruments. It's just much more appropriate for auditioning. If I can place the instruments on the stage like hear the ringing of bells, the vibrations of the strings, the soft melody of the clarinet, and the ominous booming of the drum all from different places in front of me, from a piece I know very well, there is just more for me to listen for. Even listening to an opera solo, it is just much more likely that the singer will have a tremendously larger range than your typical pop or rock star. Not always, but most often.

That said...

The question Yeollax asked is which of the two speakers (B&W 704 or Sonus Faber Concerto) would best be able to reproduce the music they listen to, which is mostly classical. It seems to me that most people here give the B&W the nod, or am I gauging this wrong?