Amen brother! I am over 60, VR is finally starting to realise my lifelong dreams for it -- totally hooked on the tech, and Beat Saber is great fun. But oh, the music... so off-putting, I can find maybe 2 tracks that I can actually stand to listen to, in the default library.
So I'm delighted to find there's a way to get some more palatable music into the box and will be working on that soon.
I was quite naive about the app when I first read about it. I thought it was mapping on a run-time, per-song basis -- doing an analysis of the audio file, finding and marking strong downbeats and backbeats, detecting crescendi and diminuendi and generating a (possibly non repeating) map for the appearance and timing of floating targets.
I thought I'd be using it with my own enormous (and, may I say, legitimately acquired!) mp3 library. In my dreams, I guess I thought it would support UPnP/DLNA and playlists. Woo hoo!
So I was seriously disappointed to find it so limited -- offering only prefabricated "beatmaps" glued to pretty much unlistenable techno tracks. I was going to give up and ask for a refund... but then stumbled across a few articles like this one which document ways to sideload beat maps into the app. It's a LOT harder to do this if you're using a standalone Quest 2, which means I may actually buy the game AGAIN on Steam just so I can use my own music :-)
I'd actually pay a premium for a Beat Saber library based on big, splashy classical music. Imagine Beat Sabering to some rapid-fire Bach variations, or over-the-top Wagner... Or more challenging yet, howbout West African pop with wonderful polyrhythms not restricted to 4s and 3s? Or wild Turkish belly dance music? Or heck, generated algorithmic music in the genre of your choice -- the app could generate the tune and the beatmap at the same time :-)