My idea is, you should make a good mini song game inside the the app. Who travels a lot and dont want Just listen the music also draw his/her attention a song game what he listening to play with them to spend the time.
I think its a new idea and make ppl spend more time to use spotify.
Updated on 2018-10-27
Maybe you could develop more your Idea about a game inside the app, since similar ideas has also been suggested here:
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