Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/4
Q:1/4=120
M:3/2
K:Amin
['c B A']  
X:1
L:1/4
Q:1/4=120
M:3/2
K:Amin
 c B A G E2 | c B A d B G | c B A G E3/2 G/ | A G c B A .G | E2 E3/2 D/ C2 | G E A d B G | 
 E3/2 F/ E D C3/2 G/ | A G c B A G |]  