Oh yes, you also want some Sousa marches pruni (straight face during Liberty Bell please), maybe some Strauss waltzes, a lot of Mussorgsky's Pictures at an Exhibition (especially the Great Gate of Kiev), and maybe some Offenbach and G & S.
I wonder if he might also like some of the Brandenburg Concertos.
Oooh, and also
Anvil Chorus from Nabucco, the March from Aida...I normally loathe Verdi but I think it has its place
Finally, you might want to try him on this if you can find it in your local library. It's been really popular with the dcs and the Oxford Concert Party are fab. Some of them are also music therapists and IMO this record somehow demonstrates their innate understanding of children's musical preferences. It's mostly world music - a great introduction to Astor Piazzolla for example.