Create a musical composition based on the alphabetic representation of the predetermined pattern and the given melodic theme.
X:1
L:1/16
M:2/4
K:G
['G4 d4 B2AB G2AB c2B2 A2G2 FGAF', 'B2d2 e2d2 e2f2 g6 d2ef g2fe d2cB']  
X:1
L:1/16
M:2/4
K:G
 G4 d4 | B2AB G2AB | c2B2 A2G2 | FGAF D2>D2 | E4 F4 | GFGA G2d2 | B2AG A2GF |1 G6 z2 :|2 G6 d2 || 
 dedc B2d2 | dedc B2d2 | e2d2 e2f2 | g6 d2ef | g2fe d2cB | e2dc B2AB | c2B2 A2G2 | F2EF D2>D2 | 
 E4 F4 | GFGA G2d2 | B2AG A2GF |1 G6 a2 :|2 G6 z2 ||  