I love Storm but wouldn't that be considered a "backdrop" since it's literally on a backdrop?I was thinking "lead entity" as well. A singer is a natural fit for that of course. But it could be any instrument and with or without voice.
Really hard to argue with any of the posts here!
Sometimes the "frontman" for a band is their stage show. I wanted to mention something about Pink Floyd... so Storm Thorgerson?
Interesting though that a backdrop could be a front entity.