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:D
['B,A,B,C DCDE', 'FBBA B2']  
X:1
L:1/8
M:4/4
K:D
|: B,A,B,C DCDE | FGFE DCB,A, | B,A,B,C DCDE | FBBA B4 | B,A,B,C DCDE | FGFE DCB,A, | 
 B, A,B,C DCDE |1 FEDC B,4 :|2 FEDC B,CDE || FBBA B2 Bc | dcBA BFFE | FBBA B2 FB | AFFE F2 FE | 
 FBBA B2 Bc | dcBA BFFE | FBFE DCB,C | DB,CA, B,CDE | FBBA B2 Bc | dcBA BFFE | FBBA B2 FB | 
 ABFB ABFE | FBBA B2 Bc | dcBA BFFE | FBFE DCB,C | DB,CA, B,4 ||  