Discussion suggests it's some kind of music/bard related skill.
Any thoughts?
Awesome! But why would music playing be a skill? :/
Couldn't this be a skill cape like the quest cape for unlocking all the music?
I agree with the above statement. I would guess it also has something to do with the musicians all over runescape as well.Like people have said previously, it's an update for unlocking all the music tracks. It's like when you do all the quests, you get the quest cape. When you unlock all the tracks, you get the music cape.
Jagex said they were working on doing that in an update like a year ago.

