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Never heard of spotify but if it's anything like Limewire, KaZaa, frostwire, ect..it's usually very easy to get viruses using these programs. Private/invite only torrent comunnities are the best. There is virtually a zero percent chance of the files infecting your computer using these pseudo-private p2p torrent communities (torrent trackers) becuase all the torrents will be reviewed by users who dl them and if they contain any malware, the user who upploaded would most be banned. It's similar to sites like pirate bay, only its a more tight-knit, secure comminity. Waffles.fm is a good one I know of. I'm sure there are many more music trackers out there just not sure of the names; IP Torrents is a good tracker for pretty much everything: music, movies, tv shows, documents, porn, ebooks and whatever else. Agian, access is granted on an invite only system.
Then once you have access to the tracker use programs like Vuze, UTorrent, BitTorrent to download.