Sorry if this isn't the best place to ask, but I cannot for the life of me remember the name of this anime I used to watch. It was about a younger guy who was the vocalist in a rock band who falls in love with an older guy who is indifferent to him. I know the kid had purple hair, too. I don't believe there were any actual adult scenes, although quite a bit of "implied" stuff goes on.

Pic unrelated, I don't have any yaoi stuff to post.