Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:2/2
K:Cmin
['', 'ec c/c/c c2 Gc', 'efge defb']  
X:1
L:1/8
M:2/2
K:Cmin
 g |: ec c/c/c c2 Gc | Bcde fbfd | ec c/c/c c2 Gc | egfd c/c/c g :| efge defb | dBfB gBfd | 
 efge defb | dBfd c/c/c c2 | efge defb | dBfB gBfd | efg=a bgfe | dBfd c/c/c g2 |]  