I don't think the Elves only performed the usually portrayed, soft and ethereal songs, though it could be used as a general rule for them all. Different humans have different styles, so why not different Elves? Sindar The woodland Sindar could be the ones making mostly the soothing music, considering that the forests are proven to be calming environments, healthy for the mind. Falmari / Falathrim These spend a lot of time at the sea or near the bodies of water, so I expect something shanty like to pass time on the ships, while adding an atmospheric effect to it and a motion like water. Vanyar I would think something celestial or exalted, with Vanyar being described as the elves of the air and the friends of gods. Something fit for a heavenly celebration, though not only for it - Aldudénië is a lament. And of course, as poetic as possible. Noldor Given their deeds are quite metal, I would think they allow their music have more grandeur, drive and weight without avoiding hard topics such as Noldolantë. So basically something with the basics of metal, but another acoustic genre altogether. Classical has pieces like that. Just putting this out there, give your thoughts.