How about you change it to the Artistry skill, add a canvas to the PoH and paint on it to give boosts that are active wherever you are, though stronger when near your PoH's location?
I've actually had an idea for the artistry skill-music and art-brewing for quite a while, but never had time to make a thread on it, and you more or less beat me to it!
I assumed this would be more like a bard where you can provide buffs to people/yourself with it, however I am nonetheless in support of what it actually ended up being when I opened it!
Do you think the big summer update of 2019 has something with a likely new music skill? SONG OF SEREN would just be a sample of how the music would begin to influence more in the game! But I'm just theorizing.
Good idea, but you should make music a combat skill in and of itself. Attacking with sound like banshees do, or overwhelming an opponent with the epicness of your rock song.
If you want to make it a combat based elite skill:
Requirements = 70 in Constitution, Prayer, Summoning and Defense
70 in Attack, Strength, Magic, and Ranged is required to use the skill to 'buff' those as well.