Develop a musical piece that combines the given theme and letter-structured outline.
X:1
L:1/8
M:4/4
K:D
['ABdf gfed', 'd2 fd']  
X:1
L:1/8
M:4/4
K:D
 B2 TBA B2 dB | ABdf gfed | A2 AF A2 dB |1 ABdf gfed :|2 ABdf gfec || d2 fd efge | d2 fd Tg2 fe | 
 d2 fd efgf | eaaf gfec | d2 fd efge | d2 fd g2 ga | bgaf gfed | (3Bcd ef gfed ||  