Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
Q:1/2=90
M:2/2
K:G
['g2 dc BGBd cdBc ABFD', 'Bc dgBg dgbg caBg']  
X:1
L:1/8
Q:1/2=90
M:2/2
K:G
 d2 | g2 dc BGBd | cdBc ABFD | GFEB cBAG | FGAF D2 d/e/f | g2 dc BGBd | cdBc ABFD | GFEc BcAF | 
 G2 G2 G2 :: Bc | dgBg dgbg | caBg AgaB | cdBc ABGB | FGEF D2 Bc | dgBg dgbg | caBg AgaA | 
 GBdB cAaf | g2 g2 g2 :|  