Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
Q:1/8=180
M:4/4
K:D
['A2 FA', 'd2 fd']  
X:1
L:1/8
Q:1/8=180
M:4/4
K:D
 dB | A3 A B2 dB | ADFA BEEB | A2 FA BdAd | BdAG FD D2 | ADFA BdcB | A2 FA BEEF | G3 A Bdeg | 
 fdec dBAB || d2 fd edBd | egfe dBAB | d2 fd egfe | dBAG FD D2 | d2 fd edBd | egfe dBAB | 
 defg a3 g | f2 eg fd d2 ||  