Craft a musical composition that incorporates the supplied alphabet sequence and motif.
X:1
L:1/8
Q:1/2=90
M:2/2
K:C
['c2 eg', 'g4 GABc defg ecaf dBGB cecA fdBg']  
X:1
L:1/8
Q:1/2=90
M:2/2
K:C
|: c2 eg fedc | Bcde fdcB | c2 eg B2 dg | Aag^f g4 :: GABc defg | ecaf dBGB | cecA fdBg | 
 ecGB c4 :|  