Be sure to skip the ads on all of these, including J Benedict's one.. Note: the movie came out in 1942, during WWII.

Yankee Doodle Dandy - James Cagney - Mickey Rooney - Judy Garland (note: mostly Cagney).
https://www.youtube.com/watch?v=StDpLge_ITM

James Cagney - 'Yankee Doodle' Medley
https://www.youtube.com/watch?v=v4ze_OB1I5k

Nice, even if no Yankee Doodle -- good Cagney from same movie:
https://www.youtube.com/watch?v=56qQYwOmkXw

ditto -- same movie, Cagney as FDR
https://www.youtube.com/watch?v=cmk3qDLVMyE

*****Wonderful finale from wonderful movie: Yankee Doodle Dandy --
Yankee Doodle Dandy Finale**** must see *****
https://www.youtube.com/watch?v=v1rkzUIL8oc