I know there must be a few bitcoiners who use di.fm
Surprisingly - it seems the di.fm admins say they haven't had any requests for it before
(I don't believe this - as I submitted a request a while back using their contact form)
Check out this thread: http://forums.di.fm/general-help-and-support/bitcoin-for-payment-of-premium-service-251775/
Please don't sign up for that forum and post there if you're not already a forum member (like I did!) - because that just looks like a dodgy campaign, but if you're already a di.fm forum user - please consider mentioning your support for the idea of accepting bitcoin on that thread.