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
['AAAc e2 de c/B/ABc', 'ecBA EFFA EFAc d/c/BcA BdcB AcBA FBAF']  
X:1
L:1/8
M:4/4
K:A
|: EFcF AAAc | e2 de c/B/ABc | FdcF ABAF | EFAE ABBB | BcAF AAAc | e2 de c/B/ABc | efaf abbb |1 
 afea fecA :|2 afea fefe |: a2 a2 feca- | a a2 f ecBA | EFFA EFAc | d/c/BcA BdcB | AcBA FBAF | 
 EFAE ABBB | cefe a4 |1 afea fefe :|2 afea fecA ||  