Android/iOS: Your favourite tunes are probably spread out on multiple services, but Qus brings them all together and lets you mix and match for killer playlists. We've talked about a few similar services before, but Qus supports more sources and puts them all on your phone for on-the-go listening. Qus supports Spotify, YouTube, Soundcloud and Deezer, and the team behind the app plans to add even more (including Tidal and iTunes) in the coming weeks. That means that no matter where your favourites live, you can add them to a single playlist, listen to them in any order that you want or build great playlists using all of those services as sources and enjoy them in one app. You'll need premium accounts for Spotify and Deezer to make use of those two, but once you have your accounts connected, you can search all of them for a song you're looking for (including the service's own music library of shared tracks and your phone's local storage), or pick and choose from songs you already have saved.
Like any good music player, you can shuffle or rearrange tracks in your playlists; create as many playlists as you like; repeat songs or playlists; and fast forward, rewind and skip tracks. If one of your tracks is a YouTube video, you can full-screen it to watch, or dismiss it just to listen to the audio. If playlists aren't enough, you can heart specific songs to add them to your "crush" list of special tracks.
Qus has a social element too -- the usual stuff like friends and followers where you can engage with other users, share tracks, get recommendations and so on. The app is completely free and cross platform. Check it out at the link below.