I’m on a quest to clean up my music library. I decided to give up and make all my music filenames ASCII; no µ-Ziq, no Sigur Rós, no préludes. I feel bad but after 10 years of struggles I still occasionally run into problems with Unicode filenames. Also most music players are grabbing the display info from metadata tags anyway, the filenames don’t matter so much.
Anyway, here’s a quick trick for finding non-ASCII filenames
LC_ALL=C find . -name ‘*[! -~]*’
The find range names any character outside 0x20 to 0x7f. The LC_ALL setting is presumably to disable any proper text processing. Ie: bytes, not characters.
The bigger project here is the music library grooming. I had this all locked down in 2008 or so when almost all my music was ripped by a service. But since then I’ve acquired a bunch of music of uncertain provenance with all sorts of random tags. I think it was when I discovered I had a Genre named “drownstep” I realized it was time to clean things up.