Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/8
M:4/4
K:G
['g2 (3(fed) (3(edc) (3(BAG) FGAB cedc Bdgf', 'g2 defg defg agfg agfe dbca BgAf']  
X:1
L:1/8
M:4/4
K:G
 d2 | g2 (3(fed) (3(edc) (3(BAG) | FGAB cedc | Bdgf ebag | fa (3(gfe) d2 ef | 
 g2 (3(fed) (3(edc) (3(BAG) | FGAB cedc | Bdgf ebag | g2 b2 g2 :: defg defg | agfg agfe | 
 dbca BgAf | da (3(gfe) d2 ef | g2 (3(fed) (3(edc) (3(BAG) | FGAB cedc | Bdgf ebaf | g2 b2 g2 :|  