Okay, let's just say they're not just music he likes. What else can we get from those songs? Is there anything to get?
I think there’s definitely something to get. It’s why I’m tracking them. From a cursory glance, Sherlock is clearly in love with John - we knew that.
The most interesting song is ‘you belong to me’ by far, because to me, it implies cheating.
Although (although) we’re apart
You are a part of my heart
You belong to me