Create a composition by utilizing the given alphabet-based musical pattern and the provided melodic theme.
X:1
L:1/8
M:6/8
K:G
['B A']  
X:1
L:1/8
M:6/8
K:G
 G | B B A G2 G | (B2 A) G2 d | e/ e/ e e d2 B | (d3 d2) d |"^(a)" e2 e d2 B | B2 A G2 d | 
 B3/2 d/ d G B A | G2 G d2 d | B>B d B B A | (A3/2 A2) |]"^(a)" e2 e d2 c ||  