Actual problems in Data Science/Machine Learning connected with music
You could begin your journey by picking up one of the topics present in the magenta project started by google. It's open-source so you could pick up some great ideas there.
Link to Magenta: https://magenta.tensorflow.org/
Another aspect you could go ahead with is trying to combine to genres of music and produce something new. There are also surveys in recommendation for music. Spend a day getting to know what's there and if you could take up a certain drawback from a paper and go ahead with it!
Finally, if nothing clicks, you could refer to chapter 8 from here: https://arxiv.org/abs/1709.01620
This paper is a survey on deep learning for music generation! The 8th chapter focuses on current problems and future prospects.