This song, written by Clare Fischer and popularized by Art Blakey and Freddie Hubbard, is quite challenging. It is AABA, but each section is 16 bars with a lot of changes, so rather dense and unconventional. The melody has haunting, distant intervals. If you don't know this tune, you will almost certainly need a lead sheet. It is in the "World's Greatest Fake Book" by Sher Music. If you have trouble finding a lead sheet, send a private message.
It is common for jazz tunes to have somewhat conventional chord changes in the A sections, and to go crazy in the bridge, wandering into distant key centers. This tune reverses that pattern. The bridge is actually quite conventional, but the A sections really move around.
Oh, and it is in 6 flats (concert pitch.) Don't play any F-flats.
Plan to spend some serious time on this one. The song is well worth the effort.