Here is a Beatles roleplay that anyone can participate in.
You can pose as a Beatle or Beatle person in each post. You may make ANY comment -- about Beatles news, a lyric, a thought... You may pose as multiple Beatle people in one post. Any one can reclaim a Beatle or Beatle person as long as they make another post.
Follow my example:
John: Hey, now this is a good idea.
Paul: Oh yer, bloody good.
George: Ey heard about the news today?
Ringo: No, what is it?
George: Well, I don't know.. I was asking you.
So, keep the dialogue going. Anything goes!