Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:2/4
K:F
['FAcf edcf efge |{g} .f/.e/.f/.g/ a2 FAcf', 'cB BA A2 d>efd dc c2 |{g}']  
X:1
L:1/8
M:2/4
K:F
 FAcf | edcf | efge |{g} .f/.e/.f/.g/ a2 | FAcf | efgf | efge | f2 z2 :: c>d cB | BA A2 | d>efd | 
 dc c2 |{g} .f/.e/.f/.g/ ag | fed^c | d2 e2 | f>edc | BAGA | B>AGF | ED C2 | FAcA | Bdgf | ecde | 
 f2 z2 :|  