Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:6/8
K:G
['d^cd Bgf age d2 c', 'A AFd dAF GEe e^cA', 'd d>ed =c2 B A2 B c2']  
X:1
L:1/8
M:6/8
K:G
 d |{e} d^cd Bgf | age d2 c | Bdg bBc | edB A2 d | d^cd Bgf | age d2 c | BgB BAc | edF G2 |] A | 
 AFd dAF | GEe e^cA | AFa afd | e^cA d2 A | AFd dAF | GEe e^cA | AGa afd | e^cA d2 |] d | 
 d>ed =c2 B | A2 B c2 a | aba g2 f | g2 a b2 d | d>ed =c2 B | A2 B c2 a | aba g2 f | g2 b2 g2 |]  