Construct a musical composition utilizing the provided motif and conforming to the specified structure.
X:1
L:1/8
M:4/4
K:G
['', 'dBcA BAGB', 'G FDEF'  
X:1
L:1/8
M:4/4
K:G
 Bc |: dBcA BAGB | ABAG FDBc | dBcA BAGB | ABAF G2 Bc | dBcA BAGB | ABAG FDEF | DFAB AGFG |1 
 ABAF G2 Bc :|2 ABAF G2 ef || gagf e d3 | c4 A3 G | FDEF DEFD | EDFD ED D2 | gagf e d3 | c4 A3 G | 
 FDEF DE F2 |1 [GB]3 [GB]3 ef :|2 [GB]3 [GB]3 Bc ||  