Construct a musical composition utilizing the provided motif and conforming to the specified structure.
X:1
L:1/8
M:2/4
K:G
['BB d>B GG B2 cc/B/ AB/A/', 'AA/A/ AA/A/ Ad/f/ aa gg/f/', 'B2 cc/B/ AB/A/'  
X:1
L:1/8
M:2/4
K:G
|: BB d>B | GG B2 | cc/B/ AB/A/ | GB d2 | BB d>B | GG B2 | cc/B/ AB/A/ | GG G2 :: AA/A/ AA/A/ | 
 Ad/f/ aa | gg/f/ ee | ff/e/ dd | AA/A/ AA/A/ | Ad/f/ aa | gg/f/ ef/e/ |1 dd d2 :|2 dc BA || 
 BB d>B | GG B2 | cc/B/ AB/A/ | GB d2 | BB d>B | GG B2 | cc/B/ AB/A/ | GG G2 ||  