I use the Despotify lib/*.[ch] library files directly in my own Spotify command line client, and as well as some modifications which aren't suitable for upstream, I've accumulated these fixes which are more generally applicable. I'd love to contribute them back to Despotify, but have had some difficulty contacting the upstream maintainers. The despotify@gmail.com address on the Despotify web site apparently has nothing to do with the developers. I was pointed to #despotify on EFnet but never managed to get a response there either.
This bug tracker also seems no longer to be in use, but I'm leaving these patches here in case I'm mistaken and it is still monitored. (I wish I could find a despotify-dev mailing list or similar, but there doesn't appear to be any such thing.)
Anyway, most of these changes are pretty trivial; the most interesting is a patch to support multiple disc albums rather than just ignoring tracks on additional discs. They've all been rebased to apply cleanly to r520 of the upstream tree.
5 Despotify patches