Unfortunately, this is all I have to show for shell.fm, which allows a console interface to Last.fm.
It’s true, I don’t have an account with Last.fm. I have a vague idea what it’s about, but I’m afraid it’s not interesting to me. A lot of things aren’t, though.
shell.fm is in AUR as shell-fm, and there is a shell-fm-git, but it looks like shell.fm hasn’t seen updates in quite a while, so there might be no tangible difference. I only found shell-fm in Debian.
Sorry to be so uninformative. If you’ve worked with shell.fm and can offer more than I, please feel free to make suggestions. It looks intriguing, but aside from what you see above, I can give you no guidance. š¦
Inconsolation 
It’s like spotify, but came around earlier, it’s more focused on music, than on paying music artists, doesn’t need a branded app only for it (and encourages to build plugin for the music player and clients that use its web apis), and its more a social network mixed with a webradio than a music player on demand like spotify. With this tool, paired with a scrobbler like lfmCMD.pl, one can avoid big gtk music players I think… This program is the part where you listen to last.fm webradios, which are like most webradios, but their track selection relies mostly on musical taste and your friends’ hints.
Thanks, that was the introduction I needed. I can’t see where that would be very interesting for me, but now I’m even more curious about shell.fm. Cheers! š
Too bad last.fm is shutting down streaming, so this program will be dead soon.