Compose a musical piece using the designated musical pattern's alphabetic representation and the assigned melodic theme.
X:1
L:1/8
M:2/2
K:G
['GA B2 Bc A2 (3BAG', 'f2 g2']  
X:1
L:1/8
M:2/2
K:G
 GA | B2 Bc A2 (3BAG | GFGA cAfe | d2 dc B2 AG | F6 GA | B2 Bc A2 (3BAG | (GF)(GA) (cA)(fe) | 
 d2 cA G2 GA | G4 || GA | cAcd f2 g2 |{a} gf ed f2 g2 | f2 ed B2 AG | F4 z2 GA | B2 Bc A2 (3BAG | 
 GFGA cA fe | d2 cA G2 GA | G4 ||  