Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:4/4
K:A
['e fAec Ba (3aaa fbaf', "fa (3aaa b3 c' bafe"]  
X:1
L:1/8
M:4/4
K:A
 A (3AAA e fAec | Ba (3aaa fbaf | e2 af ecAB | cABc AF (3FFF | A3 e fAec | Ba (3aaa fbaf | 
 eafe c3 e |1 fecB AEFG :|2 fecB ABce || a3 e fa (3aaa | b3 c' bafe | a3 e fgaf | ecBc A2 (3FFF |1 
 a3 e fa (3aaa | b3 c' bafe | a2 (3eee fgaf | ecBc ABce :|2 ABce fa (3aaa | b3 c' bafe | 
 c'bac' bafc | e2 fc ecBc ||  