"Definetly, Maybe" song Summer sings?!

Hey guys! I was wondering, in the movie "Definitley, Maybe", what is the song called that Summer (Rachel Weisz) sings to Will when they are strolling in the park!. It was the scene where she was like "until i was 16 i wanted to be on broadway"!?

Thank you! :)Www@Enter-QA@Com

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