Construct a musical composition following the given alphabetical structure and incorporating the specified motif.
X:1
L:1/8
M:6/8
K:G
['B2 A Bgf efe d2 B d3']  
X:1
L:1/8
M:6/8
K:G
 GED GAB AGA | G2 G G3 G2 A | B2 A Bgf efe | d2 B d3 d2 G/A/ | B2 A Bgf efe | d2 B d3 d2 B/A/ | 
 GED GAB AGA | G2 G G3 G2 ||  