A track like “Heart on My Sleeve,” which went viral before being taken down by streaming services this week, may be a novelty for now. But the legal and creative questions it raises are here to stay.

A track like “Heart on My Sleeve,” which went viral before being taken down by streaming services this week, may be a novelty for now. But the legal and creative questions it raises are here to stay.
Twitter didn’t move forward with the music licensing deals because of costs, people with knowledge of the matter said.