Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:6/8
K:D
['FAA dAA BAB', 'e fbb faa']  
X:1
L:1/8
M:6/8
K:D
 G | FAA dAA | BAB dAG | FAA dfe | dBA BAG | FAA dAA | BAB def | gfe f2 e | dBA B2 :| e | fbb faa | 
 fef d2 e | fbb faa | fed e3 | fbb afe | dBc def | gfe f2 e | dBA B2 :|  