Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
M:4/4
K:G
['G2 BG DGBG FGAB', 'bgaf gage d2 eg fdcA BGBd g3']  
X:1
L:1/8
M:4/4
K:G
 G2 BG DGBG | FGAB (3ccc Bc | dggf d2 eg | fdcA BGAF | G2 BG DGBG | FGAB c2 Bc | dggf d2 eg |1 
 fdcA BGGF :|2 fdcA BGBd |: g3 e d2 ef | (3ggg ga bgaf | gage d2 eg | fdcA BGBd | g3 e d2 ef | 
 g3 a bgaf | gbag fdeg |1 fdcA BGGe :|2 fdcA BGAF ||  