Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:2/2
K:G
['BdcA G3 B AF F2 cFAF BdcA', 'fdcA AG']  
X:1
L:1/8
M:2/2
K:G
 BdcA G3 B | AF F2 cFAF | BdcA G2 ge |1 fdcA dBcA :|2 fdcA AG G2 |: fgaf g2 fg | a3 g fdde |1 
 fgaf g2 ag | fdcA AG G2 :|2 f3 g a3 g | fdcA dBcA ||"^Version of 1st part" |: BdcA G3 B | 
 A=F F2 cFAF | BdcA G2 ge |1 fdcA dBcA :|2 fdcA AG G2 ||  