I'm not strong in harmony, but "Bemsha Swing" seems to have a lot of chord shifts that go down one half step chromatically, like Ami7 to AbMA7, Db7 to CMA7, Eb7 to D7. (I found the chord progressions on the internet, along with the transcription pasted in below.) The harmony seems quite complex--in relation to a fairly simple, catchy melody. I want my blog to be like that. . .