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 A']  
X:1
L:1/8
M:6/8
K:D
 D2 D |"D" A2 A A2 A |"G" B2 G"D" A2 A |"G" B2 B"D" A3- |"D" A2 z :: A2 A |"D" d2 A A2 G | 
"D" F2 E F2 F |"D" F2 A A2 G |"D" F2 E D2 F |"D" A3- A2 z |"G" B2 G"A7" E2 C |"D" D6- |"D" D2 z |]  