Songza is a free music streaming and recommendation service for mobile devices. Claiming its playlists are made by music experts, the service recommends various playlists based on time of day and mood or activity.[4][5] Songza offers playlists for waking up, working out, commuting, concentrating, unwinding, entertaining, sleeping, and more.[6] Users can vote songs up or down, and the service will adapt to the user’s personal music preferences.[6