Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/8
M:3/4
K:C
['G>B (c2 e)cdB c>A', '[Ec]4 c>d e2 e>e fd ec A2']  
X:1
L:1/8
M:3/4
K:C
 G>B | (c2 e)cdB | c>A GF ED | (C2 EGA)TB | [Ec]4 G>B | (c2 e)cdB | c>A GFED | (C2 E) G A TB | 
 [Ec]4 || c>d | e2 e>e fd | ec A2 B>c | d3 e/f/ f/e/d/c/ | (c2{BA} !fermata!B2) G>B | (c2 e)cdB | 
 c>A GFED | (C2 E)GAB | [Ec]4 ||  