Great article! according to my standpoint, we can also think about social aspect of the music. Music can play an important role in socialising and not many application has dealt with this. This digital era is all about platforms, converting application into platform can shoot your business model. 1. We can have snapchat kind of thing in which we maintain a streak of snaps, here we can maintain a streak of music, HUMs etc. This will not only increase the engagement but also hep user to discover new songs. 2. We can have music as to show our mood, like a lot of people put status on instagram, we can put music, talk with people with not ordinary memes or GIFs but musical GIFs etc.