Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
M:4/4
K:D
['d2 (3Bcd']  
X:1
L:1/8
M:4/4
K:D
 G3 B AGED | GFGB d2 (3Bcd | e2 ge dBAF | GAFA EADA | G3 B AGED | GFGB d2 (3Bcd | efge dBAF | 
 A2 GF B3 | g3 e a3 f | gage d2 (3Bcd | efge dBAF | GAFA EADA | G3 B AGED | GFGB d2 (3Bcd | 
 efge dBAF | A2 GF B3 |]  