Construct a melodic piece using the designated alphabetic pattern and the provided musical theme.
X:1
L:1/4
M:6/4
K:C
['c B', 'd c']  
X:1
L:1/4
M:6/4
K:C
 G | c3/2 d/ e d c B | c3 G3 | A B c A G E | D3- D2 B | d3/2 B/ A e c B | A2 D2 D | 
 E3/2 ^F/ G D G F | G3- G2 :: B c B d3/2 e/ f | G2 E2 E | F E D E A ^G | A3- A2 c | 
 B3/2 A/ G c d e | d3/2 c/ d G2 f | e d c A d c | B3- B2 f | e d c G c B | c3- c2 :|  