I suppose the tune has no composed chord progression, but the melody and solos are built on the given bass line. I simply inferred the harmony from the relation of the melody and bass notes. Hope this helps.
Any secrets to transcribing chords? I have the hardest time with that partly because I am not sure if what I am hearing in the bass is the root, 3rd, etc of the chord. I know it's a question of just "doing it" but it is so frustrating.