What equipment do professionals use to listen to music? Is it really all mp3 these days? Do they use bluetooth? I am mostly interested in classical music.
I am a professional musician. Based on my own experience, anecdotal observation, and articles I’ve read, we professional musicians are actually less likely to be audiophiles in the sense of being on a quest for the highest fidelity recordings.
Chosen formats are usually based on convenience or habit, whether MP3 or ones collection of old records. The important factor, typically, is clarity and differentiation of the instruments. A muddled recording won’t do, but that is rarely a problem these days—nor was it a problem in the old days after the introduction of “hi-fi” in the 40s.
The reason why many musicians are not concerned with format or finding the highest fidelity recordings may be because we have a skill of recreating music in our heads. For any recording I know well, I can isolate instruments, change dynamics, or make any number of changes while merely recalling the recording from memory.