Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/8
M:4/4
K:Gdor
['', 'GA B2 Bc d2 d^f g2 dg', 'G2 g2 dg gaba gfd_e dAGA B2']  
X:1
L:1/8
M:4/4
K:Gdor
 GA |: B2 Bc d2 d^f | g2 dg gabg | fdbg fdcd | BAGA GF D2 | G3 A BABG | F3 G AGFD | GABc dcBA | 
 B2 G2 G2 :: g2 dg gaba | gfd_e dAGA | B2 Bc dcde | fdcB AG F2 | BfdB ABcA | BfdB cd_ec | 
 d2 ga bagf | d2 g2 g2 z2 :|  