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
['E c2 BA F3 F d2 B^B']  
X:1
L:1/8
M:2/4
K:A
 E | c2 BA | F3 F | d2 B^B | c3 c | c2 ^AF | f2 BB | d2 Bc | A3 |]  