Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
Q:1/8=108
M:9/8
K:G
['', 'G2 G', 'c3 d2 B A2 G Bcd GAG']  
X:1
L:1/8
Q:1/8=108
M:9/8
K:G
"^A" D |: G2 G BAG Bcd | G2 G BAG A3 | G2 G BAG Bcd |1 GAG B2 A G2 D :|2 GAG B2 A G3 |: 
"^B" d2 B A2 G Bcd | G2 G A2 B c3 | d2 B A2 G Bcd | GAG B2 A G3 :|  