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:G
['b2b2{g} g2>e2 dedc BG-G2 AFAB cBA2 |1', 'defg a4', "f4 a2a2 b2^c'2 b6"]  
X:1
L:1/16
M:2/4
K:G
"^A"{defga} b2b2{g} g2>e2 | dedc BG-G2 | AFAB cBA2 |1 GABc d4 :|2 G4 z4!fine! |: 
"^B"{fg} a4- a2>a2 | abag f{e}d2>f2 | ecef gfe2 |1 defg a4 :|2 [df]4 [df]4 ||"^B'"{fg} a4- a2>a2 | 
 abag fed>f | e>ce>f gfe2 | defg a4 |{fg} a4- a2>a2 | abag f4 | a2a2 b2^c'2 | b6 z2!D.C.! ||  