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:4/4
K:A
['CA A2', 'CA A2']  
X:1
L:1/8
M:4/4
K:A
|: AB | CA A2 CEDB | CAFA EFAB | CA A2 AFEA | FEFA B2 AF | AAAG FEFG | A2 AF ECBA | EAEE FGAB | 
 CA A2 A2 :: (3FED | CA, A,2 A,CEA | FEFG A2 AB | CA A2 FAAG | F2 FG GBEB | CEAC BCDE | 
 F2 FG FECA | EAEE FGAB | CA A2 A2 :|  