Best music streaming app for Gear S2

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I currently have the iTunes Music family subscription. Would anyone recommend a more compatible streaming app for the 4g Gear S2 or there is no obvious benefit? The Gear Fit 2 caught my attention with the connection into Spotify so you can find specific songs and playlists. I got the free S2 with my purchase of the Note 7 and figured the Gear S2 would be more fully featured than the Fit 2?