K so like, Sirius always wanted to be a rockstar right? He always dressed super punk and has the voice for it.
But imagine…
Regulus felt like he could never talk with people about his problems. He was always so alone and felt even lonelier.
But then he over heard from some Ravenclaw that they keep a journal to help them get all their emotions out.
He decides to do so. He writes everything he feels he can’t say. He lets his handwriting get messy, he scratches things out. Some pages are just lists or bullet points. It’s the one place he can actually be himself. The only way he can figure out who he is.
He stops feeling like he’s fading away. He has something to hold onto. He can identify his feelings and really understand them.
Soon he just has journals filled with half finished poems, song lyrics he overheard (from people like his brother who refused to turn down their music), chord progressions he can’t get over from his concertos, and now, he has full songs.
He knows who he is now. He runs away to muggle America and starts a career as a mysterious new singer who just showed up on the rock scene. Violin and guitar are basically the same instrument, right? Of course his skills will translate.
His songs are filled with anger, sadness, and pain. He writes about his family, the loss of his brother, his cousin, his uncle, and what it feels like to have everyone who you loved forget you. But he also writes about joy. For having had a brother at all, for having friends (even if they are three feet tall and hate everyone except for him), for falling in love with a boy he met in a recording studio who was saved by music just like he was.
He writes about the war and the guilt of running away instead of fighting alongside his brother. And about reconnecting with said brother after Voldemort was killed by Dumbledore (Just go with it).
He was finally happy.
And if his brother got super jealous after finding him on the cover of a magazine in the boots he used to wear, well that’s just a bonus.