Develop a musical piece using the given theme and incorporating the letter-based structure provided.
X:1
L:1/16
M:6/8
K:D
['A2FD A2FD ADFD A2GF EFGA BABc defd', 'B2d2 d2fd Adfd Adfg a2gf efga bgaf']  
X:1
L:1/16
M:6/8
K:D
 A2FD A2FD | ADFD A2GF | EFGA BABc | defd B2A2 | defd eBdB | AFEF A2Bc | dBcA BFAF | EFGA B2d2 :: 
 d2fd Adfd | Adfg a2gf | efga bgaf | defd B2A2 | defd eBdB | AFEF A2Bc | dBcA BGAF | EFGA B2d2 :|  