Best use of a song in a movie...

[TruFloridaGator]

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I think In Cabaret, the young lad singing 'tomorrow belongs to me' as a folk song which slowly gets more drumbeat/militaristic as more people join in and you realise he's part of Hitler Youth, is very effective.

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Yeah, that's an excellent one.
Unchained Melody(I think) in Ghost is good, although not my favorite movie.
There's so many disney songs that should dominate this list.
The godfather theme is cool as well