I can see the value in the streaming services for this because it's easy and convenient. However, it's also fun to discover new music on your own ("pull" versus "push" for content discovery) by researching genres or musical influences/history (Wikipedia has really well organized tags for this) and then just downloading a few GB via your friendly torrent network. Sure, "piracy", but if the music is over a few decades old then it should be public domain anyways.