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=160
M:6/8
K:G
['G2 G G3 ABA', 'f2 d']  
X:1
L:1/8
Q:1/8=160
M:6/8
K:G
 d | cAG F2 D | G2 G G3 | ABA A2 G | F2 G A2 B | cAG FED | G2 G G3 | ABA B2 G | AFD D2 :| d/e/ | 
 f2 d d2 e | cAG FED | B2 G GBc | B2 G AFD | f2 d efg | f2 d cBA | B2 G cAF | G3 G2 :|  