Excuse the exaggeration – a couple of week ago I came across it so many times I thought it deserved writing-up.
Summer Holiday – in D major – so chords of D, B minor, E minor and A major
Marigold first theme (from bar 2 of excerpt) –
in E flat major – so chords of E flat, C minor, F major and B flat
Note the slight difference – F major not F minor – and the added notes in some chords and the fact that he does not slavishly repeat the pattern.
Marigold 3rd theme (from bar 3 of excerpt) –
in A flat major – so chords of A flat, F minor, B flat minor, E flat
Blue Moon in E flat also – so chords of E flat, C minor, F minor and B flat