The King and I - as a child I performed in this musical with a local theatre group and thoroughly loved it.
I was one of the children of the King (he had loads) and had some solo work but mostly joined with the others for songs. Great melodies, great romantic story and fabulous costumes. Etc etc etc!
In the original movie Yul Bryner was a fantastic King of Siam - strong, strict but willing to learn! Just.
Deborah Kerr I think played Anne the English teacher who falls for the monarch but is reluctant to commit herself. All in all a perfect musical.