I read recently over in the Lounge that Spotify still has software that works on Mac OS X/PowerPC. I don't know if it will run on Tiger (to be honest, I bet it won't) but it should run on Leopard, and that should give you a few more months of streaming music.

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The last version of Spotify to support PPC will run on Tiger and above, I'm currently running it on my eMac 1Ghz which is running 10.4.11.

It pops up a warning at the top of the client that states that this platform will not be receiving any more updates, but it's been working for me for about a year now without any complaints on the two PPC Macs I've been running it on (The aforementioned eMac and a PowerBook G4 running Leopard).