Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
Q:1/8=232
M:4/4
K:C
['ec Ad BG']  
X:1
L:1/8
Q:1/8=232
M:4/4
K:C
|: G | c2 ec Ad BG | cG EC A,D B,G, | CE DF EG FA | Gc Bd c2 cG | c2 ec Ad BG | cG EC A,D B,G, | 
 CE DF EG FA | Gc Bd c2 ce | c2 ec gc ea | gc ec Ad BG | c2 cc gc ec | Aa gB c2 ce | c2 ec gc ea | 
 gc ec Ad BG | ce df ea gf | ec dB c2 c :|  