I love that we can play Drums, Lutes and Flutes in ESO. Even though I don't expect ESO to implement a music system like Lord of the Rings Online did (wherein players could actually write their own music and upload the file to the game to play together), it would be amazing if Zenimax could implement a feature akin to Sea of Thieves.
The two features that game has which I would love to see implemented in ESO are:
(1) The song you played is static across all other players in the area. That is, everyone hears you playing the same song. Currently in ESO, I might hear myself playing Stagger And Sway, but my husband standing next to me hears me playing Ode To Queen Ayrenn.
(2) When you play within hearing range of other players, the songs mesh into one song. If they play the same instrument, they play together, and if they play a different instrument it becomes an accompaniment. Currently in ESO, when people stand near each other and play a lute, drum, and flute, it just becomes a jumbled mess of music. But we do it anyway, because we want to play with each other!
(If you're interested in what the music in Sea of Thieves sounds like playing together,
here it is. I wished I could find a video with each person playing separately first and then joining in, but alas, I could not. But that's how it works anyway!)