Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:6/8
K:D
['A2 G']  
X:1
L:1/8
M:6/8
K:D
 A | A2 F F2 F | F2 D D2 D | G2 BdcB | c3 AzA | A2 G B2 G | G2 F A2 A | A2 AABc | e2 d2 z d | 
 e2 c A2 G | F2 Adzd | e2 c A2 G | F2 Adzd | B2 BdcB | A3 dzd | c3 B2 c | d2 F B2 A | A3 g2 c | 
 d3 d z |]  