I missed MMario's link there, thought it was his sig!  (insufficient coffee).  Lloyd didn't say where he got the tune that he set Jack Orion to, but it bears an uncanny resemblance to Donald Where's Your Trousers.  Whether this was an inscrutable joke on his part, or whether both melodies were based on the same original (something not unlike Johnny Cope, perhaps) I really don't know.

Malcolm