Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:6/8
K:D
['EFD DFF', 'A2 A AFA']  
X:1
L:1/8
M:6/8
K:D
 d/B/ | AFF EFD | DFF EFD | DFF AFF | dFF EFA | BAF EFD | DFF EFA | BdB AFA | DED D2 :| A | 
 A2 A AFA | DFF FED | A2 A AFA | BGE E2 F | A2 A AFA | DFF FED | B2 d AFA | DED D2 :|  