wooo I sang "Those Magic Changes" when I was in Grease. It's one of my favorite songs from the show.
Let's see, the part of Doody, he's more of the naive one of T-Birds, really innocent and kind of like.. boy-next-door type I guess but also comical??
Hmm.. for songs choice you could sing Hound Dog, Rock N' Roll Is Here To Stay, Rock Around The Clock, Peggy Sue.. Perhaps if you need more of a ballad you could sing Tears On My Pillow, Blue Moon, Unchained Melody, Earth Angel, etc.
Hope that helps!
Don't you wanna be the life of the party?