Assemble a piece of music by merging the alphabetic representation of the predetermined musical pattern and the provided melodic theme.
X:1
L:1/8
M:6/8
K:C
['C2 C']  
X:1
L:1/8
M:6/8
K:C
 C/D/ | E2 E CDE | F2 D B,2 C | D2 E C2 C | C3- C2 C | E2 F GAB | c2 A F2 G | c2 c _B2 A | 
 G3- G2 C | E2 F GAB | c2 A F2 G | c2 c _B2 A | G3- G2 C/D/ | E2 E C2 C | A2 G G2 C | E2 D C2 B, | 
 C3- C2 |]  