
@Stoneymonster @alisynthesis
I don't use spotify, but I read somewhere that they make extensive use of #ISRC codes.
#Bandcamp supports ISRC in metadata, if you have it in the upload.
It also supports the UNSYNCEDLYRICS tag, and if your songs are on Bandcamp with official lyrics, anyone who searches for your lyrics will be sent to the track page.
@Stoneymonster @alisynthesis
Bandcamp allows album artwork as PDF (or similar), but the uploader has to care enough to include it.
I have had to email some labels and ask nicely, then download my purchases again.
There is no way to see what exactly you're going to get without downloading. Same goes for high-def files. The lossless options might be "CD quality" (16/44.1) or better.
Bandcamp only allows stereo - no surround or multi-channel, or multi-track.

I think they have to be entered on the website after the upload.
https://get.bandcamp.help/hc/en-us/articles/360007902093-My-songs-have-lyrics-Should-I-bother-adding-them-
The lyrics show up on the track and album pages, for example:
https://beruriernoir.bandcamp.com/album/abracadaboum
https://beruriernoir.bandcamp.com/track/descendons-dans-la-rue
They are put into FLAC tags but I'm not sure about other formats. I'll download something and see.