Compose a piece of music by integrating the assigned letter representation and provided tune.
X:1
L:1/8
Q:1/4=90
M:2/4
K:C
['cBAG c2 c2 d>e dB', 'G2 cdef e2 e2 d>c Bc d4']  
X:1
L:1/8
Q:1/4=90
M:2/4
K:C
 cBAG | c2 c2 | d>e dB | A2 G2 :| cdef | e2 e2 | d>c Bc | d4 | defd | c2 d2 | G>G AB | c4 ||  