How do you find new music for your collection?

The main point is searching by tags, although you can listen to previews on both platforms, and Last.fm also has free compositions. I don't see any reason to categorize Last.fm and VKontakte as different, as Last.fm is also a social network, with its own groups, VIPs (called subscribers), etc. Perhaps the thematic trolling and the requirement to post a photo are the differences, although I haven't posted a photo on VKontakte either :3.