Mixmates from Spotify offers now playlists based on what you and your best friend listen to, the length and the content of the playlist being influenced by what you two have in common. Maybe there will be no more fights at parties.
For example, if you two introduce the name of your favorite artists, Mixmates will make playlist suggestions based on these preferences. You can save the playlist if you want afterwards. If not, at least you will find out what does not sound in the friendship.Source: engadget