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:2/4
K:D
['FB AF DB, B,C/B,/ A,B, D/C/D/E/', 'AB/c/ dB']  
X:1
L:1/8
M:2/4
K:D
|: FB AF | DB, B,C/B,/ | A,B, D/C/D/E/ | FE ED/E/ | FB AF | DB, B,C/B,/ | A,B, D/C/D/E/ |1 
 FD DD/E/ :|2 FD D2 || EF/E/ DE | FA AB/c/ | dB AF | BE ED | EF/E/ DE | FA AB/c/ | dB AG | FD D2 | 
 EF/E/ DE | FA AB/c/ | dB AF | BE ED/E/ | FB AF | DB, B,C/B,/ | A,B, D/C/D/E/ | FD DD/E/ ||  