I listen to music on my desktop machines pretty much all the time. While I have bought a few tracks via iTunes I'm still buying physical CDs. Recently I've been using Spotify quite a bit, but I still like being able to listen to the music that I have in my own collection.
My desktop machine in the office has a pretty large hard drive, so this isn't an issue. Unfortunately my machine at home isn't as well endowed!
Here's what DaisyDisk tells me about my own usage:
Unfortunately that's pretty much the entire hard drive!
So would playing music from an external hard drive work?
I've got an external iomega drive that's got plenty of capacity, though it also holds backups from my other machine (the one that was stolen) and I'd rather not lose those backups since I haven't got anywhere to put them ..