Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:2/4
K:G
['c B']  
X:1
L:1/8
M:2/4
K:G
 d | c A F A | c B G d | e d c B | c B z B | c B A B | c d e f | g d e c | B G2 x | 
[M:2/4][K:G][K:treble] d | B G G d | B G G d |]  