Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/8=180
M:4/4
K:G
['(3d/e/f/ g2 d2 dedc B2 d4 ef']  
X:1
L:1/8
Q:1/8=180
M:4/4
K:G
 (3d/e/f/ | g2 d2 dedc | B2 d4 ef | gfed cBAG | F2 D4 EF | G2 G2 GABc | d2 B2 e2 dc | BdBG AcAF | 
 G2 G4 :|  