Possible Clues:

• Singer Robert
• Lancelot player in 'Camelot'
• Crooner Robert
• Crooner Robert portrayed by Will Ferrell on 'SNL'
• 1960s portrayer of Lancelot on Broadway
• Robert ____ ( Canadian actor singer)
• Lancelot player, on stage
• 1962 Best New Artist Grammy winner
• Broadway star Robert
• ''Camelot'' star