Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:2/4
K:C
['G, A,G,F,D, E,G,CG,']  
X:1
L:1/8
M:2/4
K:C
 G, | A,G,F,D, | E,G,CG, | G,FA,B, | C2 z G, | A,G,F,D, | E,G,CG, | FDA,B, | C2 z E | E>DDE | 
 DCCD | CB,A,B, | DCCF/E/ | ^CDDE/D/ | B,CCE/C/ | B,G,A,B, | C2 z |]  