
Stalkify works with everything that speak Last.fm − so if you want to be stalked, you simply need to set your Winamp, your iTunes, your Spotify or your whatever up to tell Last.fm about the tracks you're playing.
Spotify can be made to lastfmify your tracks under Preferences:

So can Spotify Mobile under More or Settings:

It's almost a certainty that your favorite music player is stalkable. Head over to Last.fm to learn how.