Manhattan Serenade is the background music that opens the Hollywood sequence in The Godfather. It's an old song, going back to 1929.

There's a version of it from the film on YouTube, but it's incomplete. Here's a link to Jo Stafford and Tommy Dorsey doing it:
https://www.youtube.com/watch?v=3MvqRvxbRoE

It doesn't seem to be in any of the regular fake or real books. It's in the old Fake Book of 1000 Songs, Volume Two. There it's in the key of F, but all the recorded versions I've heard are in G, so mine is, too.

As always, I've added some of my own harmonies.

Manhattan Serenade-Rev JE - Louis Alter