Possible Clues:

• There's a bit of music in it, but there may be a catch in it
• A sort of loop-line with a song in it
• There's a song in it and there may be a catch in it
• Is there a song in it, caught in it?
• There's a catchy song in it
• Drive gear
• Sounds as if Laurence gets at it with a rope
• The melody in this may catch you by the throat.
• There's a song in it but there may be a catch in it
• Rope's end pulled back arresting a run