This was a very popular song among swing era bands. It was written in 1928 by Jimmy McHugh and Dorothy Fields. (Look up McHugh and Fields; you will be surprised how many songs you know from them.)
This is a great jam session song because it could hardly be any simpler. Except for the bridge, it's almost a one-chord song. One the one hand, this means that the song doesn't give you a lot of ideas for improvisation. On the other hand, it's simple and you probably won't play any "wrong" notes.
Below is the chord chart. (You don't need a written melody for this one! Learn it by ear!)
There isn't too much more to say about this one, so here are many versions of it: