One of the motivations for getting my amplifier working again was the need to listen to music on a system with more depth and weight than a set of Logitech 2.1s can provide.
Since I left my CD collection in the UK my sources are all mp3, with a Soundcloud habit as well.
So, how to listen? Well, I also have a Raspberry Pi habit, and they have an audio out (in my case on a Model B it’s a headphone jack).