Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/16
M:2/4
K:G
['G2GD G2GD GABc d4', 'G4 g4 g2ga b2a2 g4 e4 e2ef']  
X:1
L:1/16
M:2/4
K:G
 G2GD G2GD | GABc d4 | e2fe d2Bd | e2fe dcBA | G2GD G2GD | GABc d4 | efge dedc | B2A2 G4 :: 
 g4 g2ga | b2a2 g4 | e4 e2ef | g2fe d2B2 | cedc B2d2 | efge dedc | B2A2 G4 :|  