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:2/2
K:Edor
['BE E2', 'fgaf ecAc', 'BEdE BE', 'BcdB cA A2 cdeA |1 cdef e2', 'efge f2 ef dcBA f3 e d2']  
X:1
L:1/8
M:2/2
K:Edor
 BE E2 BEdE | BE E2 BcdB | cA A2 cAeA |1 (3Bcd ef e2 dc :|2 (3Bcd ef e3 f || dffe dcBA | 
 f3 e d2 de | fA A2 fgaf | ecAc e3 g | f3 e dcBA | effe dcde | fdAd fgaf | ecAc e2 dc || 
"^variations" |: BE E2 BEdE | BE E2 BcdB | cA A2 cdeA |1 cdef e2 dc :|2 cdef e3 f || dfef dcBA | 
 dffe dcde | f3 e fgaf | ecAc efge | f2 ef dcBA | f3 e d2 de | fA A2 fgaf | ecAc e2 dc ||  