Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:6/8
K:C
['E D2 C']  
X:1
L:1/8
M:6/8
K:C
 G | G2 G E2 C | (G3 G) AB | c2 B c2 d | (e3 e2) E | E2 E D2 C | (B3 c2) c | d2 E D2 C | 
 (C3 C2) d | d2 d B2 G | (d3 d2) B | c2 B c2 d | (e3 e2) E | E2 E D2 C | (B3 c2) c | d2 E D2 C | 
 (C3 C2) x |]  