Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:4/4
K:D
['d3 c defd', 'dB B2 gefd', 'efge faaf']  
X:1
L:1/8
M:4/4
K:D
 d3 c defd | edBd egfe | d3 c defd | efdB A3 B :| dB B2 gefd | edBd egfe | dB B2 gefd |1 
 efdB A3 B :|2 efdB A3 e |] faaf gefd | edBd efge | faaf gefd | efdB A3 e | faaf gefd | edBd efge | 
 faaf bfaf | e3 f gefe |]  