Segment from 1962's 'The Music Man' that begins where the sheriff played by the great/late character actor Charles Lane (died at 102 July '07) informs Harold Hill (Robert Preston) of his mistake...

...then we get to the 4th of July social where the School Board
(The Buffalo Bills) insist upon Hill's credentials,
but instead learn to sing and do the tune 'Sincere'

Notice the darkbackdrop on Preston before the next scene
(a camera technique used in other films during that era)

This is from the best widescreen version on DVD,
where for the first time you get to see ALL the BBills

They don't make 'em like THIS anymore