Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/16
M:2/4
K:A
['ABcA BAFE ABcd f2e2 agae fecA', 'f2e2 agae fecA']  
X:1
L:1/16
M:2/4
K:A
 E2 | ABcA BAFE | ABcd f2e2 | agae fecA | BcBA F2E2 | ABcA BAFE | ABcd f2e2 | agae fecA | 
 B2A2 A2 :: e2 | eaga fecA | eaga f2e2 | agae fecA | BcBA F2E2 | ABcA BAFE | ABcd f2e2 | 
 agae fecA | B2A2 A2 :|  