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Google Play Music, solely for the portability of my music.
I like listening to music streams using Viu app. Here is the description. The sound quality is rather good. Sometimes there are troubles with the connection but it happens not often. The app is good for watching videos and different TV shows as well, but I use it for viewing music streams only.
Haven't really tried any other music apps besides only using the default music player on the Onkyo DP-X1A.