Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/8
Q:3/8=120
M:6/8
K:G
['G GFG', 'G2 B c2 e', 'c2 A ABA']  
X:1
L:1/8
Q:3/8=120
M:6/8
K:G
 D2 G GFG | B2 G GFG | E2 A A2 B | c2 A ABA | D2 G GFG | B2 G G2 z | FED DEF | GAB A2 G :: 
 G2 B c2 e | d2 e dBG | G2 B c2 e | dBG A2 z | G2 B c2 e | d2 e dBG | GFG BAG | FEF G3 :: 
 c2 A ABA | B2 G GAG | F2 G A2 B | c2 A ABA | c2 A ABA | B2 G GAG | FED DEF | GAB A2 G :|  