Washington, Apr 7 : `Iron Man' star Robert Downey Jr. hopes that British alternative rock band Coldplay's lead vocalist Chris Martin will perform the soundtrack of his new Sherlock Holmes film.

Downey Jr., 44, believes that Martin, 32, will be the right person for the musical score, as the rocker is a huge fan of the super sleuth.

The actor also revealed that the singer has been offering him tips about playing Holmes on the big screen, and that he hopes Martin will be a part of Guy Ritchie''s much-anticipated movie.

"We are hoping Chris Martin of Coldplay will contribute to our score," Contactmusic quoted him as saying.

"He's a huge Sherlock Holmes fan. He told me you need to be really skinny, which is always the last thing you want to hear," he added. (ANI)