Maybe someone would be interesting in this ("...melody repetition and the melody factor in Queen songs"): link
(I'm sorry if this link has been posted before)
Yeah, Denes used to post here more frequently a long while ago. His username's PD. I'm pretty sure he still checks this board from time to time. I think I last saw him post about 6 months ago.
This article originated on PD's "home" of link, where he still posts. It's the best article he's done in my opinion, which so excellently demonstrates in a scientific fashion what made Queen so great.