Thought I'd better add that the simple version I have is from 'new tune a day for alto'
This is probably of no use but here goes anyway. The simple version I have is in the Key of F (or D minor (still haven't worked out how you tell)) and the chords it has are C7 , Fm and Bbm. As for improve I'm still working on how to tell which is best (bit difficult when I can only play 5 so far)