Both have the voices for this film, and the music is full of sarcastic fits of belting, but also an aching hurt, demonstrated well in early 00's musical theater. The plot sometimes makes it difficult for the songs to have an emotional impact because there's not always a clear build. The first scene is the end of their relationship, which has an amazing performance from Kendrick, and a great song, but it isn't exactly clear how we as the audience should feel.