He also arranged for and accompanied such artists as Bob Hope, Tony Bennett, and Charles Aznavour.
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He sang some Jerry Lee Lewis songs when he was eleven years old with his brother Peter and a friend at the Sutton Granada under the name "The Blue Devils."
Roy Rogers | Roy Orbison | Roy Lichtenstein | Roy Thomas | Roy Haynes | Roy Clark | Billy Budd | Arundhati Roy | Roy Jenkins | Roy Carr | Roy Dupuis | Rob Roy | Roy E. Disney | Roy Castle | Roy Barnes | Roy Jones, Jr. | Roy Harper | Roy Blunt | Siegfried & Roy | Roy Scheider | Roy Lassiter | Roy Hargrove | Roy Chapman Andrews | Roy Williams | Roy Thomas Baker | Roy of the Rovers | Roy Hattersley | Roy Emerson | Roy Acuff | Reena Roy |
Greco performed the vocal theme to the 1972 film Something to Hide, "How Can We Run Away (Theme From Something to Hide)", which was composed by Roy Budd (uncredited on the film).