Do-di di-di-didi do-dowo-do
Do-di do-do-do doo-do
Diddly di-di-didi do-dowo-do
Do-di do-do-do doo-do
Do-di di-di-didi do-dowo-do
Do-di do-do-do do-diddly-do
Dudlo do-didlo-da do-didlo-da
Duh-di-do da-dla-daa
Do-di di-di-didi do-dowo-do
Du-dli-do di-da-dalalala.
I hope this one's easier to guess than it was to type in... I missed out the accompaniment on the grounds of sanity.