This popped into my head, although I couldn't remember what it was. My wife recognised it though, and filled in the blank for me.
It's quite a straightforward tune, but playing the melody with the standard chords requires some huge stretches, so I had to work out what inversions of the chords would let me play up the neck a bit, where the melody notes are. So I'm travelling from a D major shape on the 5th fret to a D minor shape on the third fret, to a standard G7 and C major. Then again, but substituting the D minor shape on the 3rd fret to an A shape. I don't find these changes easy, and you can hear the lack of fluency in the tricky bits.