Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:4/4
K:G
['dBBd g2', 'bg g2', 'edgd edBd']  
X:1
L:1/8
M:4/4
K:G
 dBBd g2 gd | egdB AGAB | dBBd g2 bg | abge g3 z || bg g2 agef | geeg dega | bg g2 agbg | 
 abge g3 a | bg g2 agef | geeg dBGA | B2 BG AGEG | GEDE G3 z :| edgd edBd | egdB A2 Bd | 
 edgd edBd | gabg abgd | edgd edBd | egdB A2 GA | B2 BG AGEG | GEDE G3 z :|  