Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:2/4
K:A
['A2 AA A2 c2 B2 e2 c2']  
X:1
L:1/8
M:2/4
K:A
 A2 AA | A2 c2 | B2 e2 | c2 A2 | B2 BB | B3 A | G2 F2 | E2 z2 | A2 AA | A2 c2 | B2 e2 | c2 A2 | 
 B2 BB | B3 A | G2 F2 | E2 z2 | c2 cc | c2 Bc | d2 c2 | B4 | e2 ee | e3 c | dcde | f4 | e2 ee | 
 e3 c | BABc | A2 z2 |]  