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
['G>A B>A', 'B>d d<d d>d d<B']  
X:1
L:1/8
M:4/4
K:D
 B,<D D<E G>A B>A | G<E E>D E<G E>D | B,<D D>E G>A B>A | G<e d>B A2 G2 :: B>d d<d d>d d<B | 
 B>e e<e e>g e<d | B>d d<d d>d d<B | B<e d>B A2 G2 :|  