Develop a musical piece incorporating the designated alphabet-based pattern and the supplied melodic theme.
X:1
L:1/4
Q:1/8=200
M:3/4
K:C
['d e', 'd/)c/B/ A c c (d3/2 e/)d/c/ B']  
X:1
L:1/4
Q:1/8=200
M:3/4
K:C
"^Cantabile" c G A | G F E | D E F | E3/2 D/ C | G c B | c d e | d e c |({cA} B3/2 A/) G :| 
 (c3/2 d/)c/B/ | A c c | (d3/2 e/)d/c/ | B G G | A A/_B/A/G/ | F/G/A/G/F/E/ | D c B | c3 :|  