Who wrote music for A Little Night Music?

The suite "Eine Kleine Nachtmusik" (a little night music) is an instrumental composition by Wolfgang Mozart in 1787. It was originally known as Serenade No. 13 for Strings in G major (K. 525).

In 1975, Stephen Sondheim used the title (likely an homage to Mozart) for his musical "A Little Night Music". See link for more.