Develop a musical composition using both the specified melodic theme and the alphabetical pattern naming.
X:1
L:1/16
Q:1/8=120
M:3/8
K:G
['(GA) B2B2c2 d4', 'D2 c2c2D2 B2B2G2', '(Bc) d2d2g2 d4']  
X:1
L:1/16
Q:1/8=120
M:3/8
K:G
 (GA) | B2B2c2 | d4 (ge) | d2(de)(dc) | B4 (GA) | B2B2c2 | d4 gb | a2agab | g4 :: D2 | c2c2D2 | 
 B2B2G2 | F2FAGB | A2A2 D2 | c2c2D2 | B2B2G2 | GFEDEF | G4 :: (Bc) | d2d2g2 | d4 (Bd) | c2c2A2 | 
 B4 (Bc) | d2d2g2 | d4 g2 | (gf)(ed)(ef) | g4 :|  