[S] Anime about a Purple-haired Violinist

A little over a decade ago, a friend of mine showed me this anime when we were hanging out at her place. I believe the anime was about music and characters who played different instruments. One character in particular I remember played the violin. He had long, purple hair. I have been trying to find this anime for awhile but I have never been able to find it via Google search. Which is odd to me because it seems like such a specific character.

Can anyone find this anime?