Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
M:6/8
K:A
['E>FG |[M:9/8] A3 F3 E>FG |:[M:6/8] A2', 'A3 F3 E>FG', 'B>AB c2 c- cBA Bec BAG']  
X:1
L:1/8
M:6/8
K:A
 E>FG |[M:9/8] A3 F3 E>FG |:[M:6/8] A2 A- A>GA | B2 B- B>AB | c2 c- cBA | Bdc BAG |1 
[M:9/8] A3 F3 E>FG | A3 F3 E>FG :|2[M:6/8] A2 B c2 d || e2 e e2 a | fed c2 d | caa cBA | 
 B2 B- B>AB | c2 c- cBA | Bec BAG | A3 ||  