[mmmm]

http://despotify.sourceforge.net/

Not sure if it still works. If it does work it requires that your user is subscribed to Spotify Premium I believe.

[wakaflockafliz]

For Spotify, there is also Artem Gordinsky's fabulous Spotifree:

https://github.com/ArtemGordinsky/SpotiFree

http://spotifree.gordinskiy.com/

DISCLAIMER: This has nothing to do with command-line anything, it's just a useful project I discovered and wanted to share.