It depends upon the type of music being mixed and assumptions about how it will be played back. For classical it's usually mixed for accuracy. It's similar for jazz. For pop, rap, modern country it can be very different and "compromise" mixes are more common. Remember, large amounts of music is now experienced in a digitally compressed format, a digitally compressed format accompanying video on a computer, thru very cheap headphones, as part of a video game, etc. It really doesn't make that much sense for an artist/producer/engineer to produce highly dynamic, wide frequency music when that's the case.
classical label monitors
Does anyone know what monitors are used by classical music labels such as Harmonia Mundi, Linn, DG, EMI, Decca, Pentatone, Chandos, and the inhouse label that produced MTT's Mahler cycle? I know that Telarc uses ATC but I have not found a source for what these other labels use.