OMG I think I know. Kevin or Nick Jonas. XD Sorry about getting so rialed up but my mom is kinda poopin her pants over it. Anyway, Are you Kevin or Nick Jonas? Everyone thinks someone like Justin Timberlake or Eminen (or how ever the heck you spell his name) But you said you were one of the Jonas brothers, and even after that people were saying other people. Some people didnt even read your whole thred start! They were saying like Reannah (again, or how ever you spell her dang name) or Miley Cyrus. Plus I know Joe Jonas might not even have the guts to just sit on here and do this where Kevin is more kiddish. I think its more Kevin then Nick also because Nick is mostly writting lyrics, thinking collage stuff and I congrats him on that, he is smart and can go far but Kevin can play pranks, play kid games and even go and interact with kids over the web. So that way I'm Saying that Mystery Composer is Kevin Jonas.
Even though he isn't THAT young...(wouldn't call him old either) I hope its Matthew Bellamy, the lead singer of Muse. He is the closest "popular music" can get to being a composer. Most other "popular music" is junk in my humble opinion.
It would have been amazing if it was Bellamy!!! I LOVE MUSE and it made my day hearing that someone else had that thought when they saw this too(: But anyway the music wasnt that great. I mean not that i was expecting a lot but I think it could have been better. I think the one i like the most would have to be Drums of Battle or whichever one plays when your fighting(: