Both in the third act of the film, almost back-to-back:
- Johansson, her mom (Julie Hagerty), and her sister sing part of "Crazy" at a party.
- Driver sings "Being Alive" at a piano bar with his friends/colleagues. I knew the song was coming, but (further spoiler)
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I was NOT prepared for Driver to say all the incidental lines ("you're onto something, Bobby" etc). It's a stunning climax to one of the better films of the year, and Noah Baumbach (dir) and Driver have talked about their mutual love of Company.