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:Edor
['BE E2', 'Beeg fded Beed B2 AF']  
X:1
L:1/8
M:4/4
K:Edor
 A | BE E2 BAFA | BE E2 dBAF | BE E2 Bcdf | ecdB A2 FA :| Beeg fded | Beed B2 AF | Beeg fdec | 
 dBAF BE E2 | Beeg fded | Beed B2 AF | ABde fdec | dBAF B2 cd ||  