Develop a musical composition based on the provided pattern of letters and incorporating the given motif within it.
X:1
L:1/16
M:2/4
K:Gmix
['A2>G2 AGAB', 'dcde fefg']  
X:1
L:1/16
M:2/4
K:Gmix
 A2>G2 AGAB | c2B2 A2G2 | A2>G2 AGAB | c2 d4 B2 | A2>G2 AGAB | c2B2 A2G2 | A2>G2 AGAB | c6 B2 :: 
 dcde fefg | f2e2 d2c2 | dcde fefg | f4 e4 | dcde fefg | f2e2 d2c2 | dcde fefg | gfed cBAG :|  