I am working on a lead sheet for the Bobby Timmons tune Dat Dere, from the Art Blakey version, in Cm. (Same as in the Cannonball version and in the Timmons version). Got the intro, the AABA, the solos, the out chorus, but just can not get those last three chords. There are three final formatas. It sounds to me like three consecutive chords, all with C in the melody, with chromatically descending bass notes- Eb, D, and finally Db (yes- it never resolves). The harmony over the D sounds like a Dm7(b5), and the final chord sounds like a Db maj7. But for the life of me I can not figure out the harmony over the Eb. Every harmonization I can think of sounds either bad, awful, or merely wrong. Of course I have listening to this over and over so maybe my ears are sick of the tune. Anyone able to set me straight on this? Thanks.