Magic Playlist - Get the playlist of your dreams based on a song
Pandora Premium - On-demand music. Pandora's answer to Spotify.
Spotalike - Spotify playlist with similar songs, according to Last.fm
Spinlist SongShare - Share and play any song in iMessage for free
Playlist Machinery - Tools that help you create & organize your Spotify playlists
Amio - Amio is an easy-to-use conversational AI platform that enables the creation of highly reliable chatbots.