Magic Playlist - Get the playlist of your dreams based on a song
User Interviews - User Interviews is a tool to recruit participants for product tests and market research.
Spotalike - Spotify playlist with similar songs, according to Last.fm
CrawlQ Audience Research - Target the Right Audience using the Predictive Intelligence
Playlist Machinery - Tools that help you create & organize your Spotify playlists
ExactBuyer - Real-time B2B and B2C audiences & intelligence