Design a musical composition incorporating the alphabetic expression of the chosen structure and the provided melodic theme.
X:1
L:1/8
Q:1/8=120
M:2/2
K:G
['(3fed (3cBA']  
X:1
L:1/8
Q:1/8=120
M:2/2
K:G
 (3DEF | GABc d2 Bc | defg A3 A | ABcd e2 cd | e2 ag f2 (3def | g2 fa g2 (3B^c^d | e2 ^df e3 f | 
 gGGA Bc (3d^cd |1 (3fed (3cBA G2 :|2 (3fed (3cBA G2- | G8 | |]  