I love when musical films use the songs as leitmotifs in the score. A great example of this is Mary Poppins. Irwin Kostal did a great job making motifs for all the Sherman Brothers' songs like using "A British Bank" for Mr. Banks himself. In fact, he took a deleted song for Admiral Boom and used it as his motif in the score anyway.
Can you think of other great examples, be they by the original composers of the songs or others?
jthanny t1_ja8e9rp wrote
The use of tritone and minor 7th motifs all over West Side Story. Once you start noticing them, they are everywhere. Tritones signaling tension, incompatibility, hatred, and strife with the 7ths contrasting with hope, peace, and a chance to escape the fate. And just how discordant they feel when in medleys really emphasizes the struggle, and the option to how to resolve the finale can literally change how the entire show feels.