Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/8
M:2/4
K:G
['GBdB cABG GBdB c2 B2']  
X:1
L:1/8
M:2/4
K:G
 GBdB | cABG | GBdB | c2 B2 | GBdB | cABG | GBdB | c2 B2 | AA/B/AA/B/ | AA/B/ A2 | AA/B/AA | 
 AGFz/d/ | B2 z d | B2 z2 |]  