The Flash Supergirl Musical Crossover: 14 Easter Eggs & References In 'Duet' You Need To See
7. Put A Little Love
One of the show's big musical numbers is not lifted from an actual musical, but rather the Jackie DeShannon song Put A Little Love In Your Heart.
It gives the episode its best chance to show off its dazzling production design and dance choreography, even if it is a little too brief, and it's also a massive bit of foreshadowing for the end of the episode.
The song sees Music Meister et al telling Kara and Barry to put a little love in their hearts, which turns out to be exactly how they get out of this musical.
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