Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:6/8
K:G
['z2 d']  
X:1
L:1/8
M:6/8
K:G
 B | B2 BBAG | A3 z2 B | B2 BBAG | A3 z2 d | BBdBBB/B/ | d3 z2 d | BBBdcA | G3 z2 d | B2 BAGA | 
 G3 A3 | B2 ddcc | B3 z2 |]  