Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/16
Q:1/8=80
M:2/4
K:G
['G2GB A2GA B6']  
X:1
L:1/16
Q:1/8=80
M:2/4
K:G
 dc | B2G2 A2EF | G2E2 D2DE | G2GB A2GA | B6 (3GAB | c2-cd c2BA | B2Bc B2AE | G2>A2 BGAF | E6 Bc | 
 d2>e2 B2G2 | A2G2 E2DE | G2GB A2GA | B6 Bc | d2de =f2e2 | d2B2 d2(3edc | B2GB A2G2 | G8 |]  