I dont store all music in a single folder, however i'll list as much as i can:
My mp3 player (phone): 1.9GB, 329 files.
Every single audio file on my drives (according to windirstat): 56.97GB, 36078 files.
Not all of these are actually music, many are sounds and stuff, its also alot of duplicates in there but it's the most accurate i can get
I actually know a guy that has almost 2TB of music