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:C
['G2 GA']  
X:1
L:1/8
M:4/4
K:C
[M:3/4][K:G] beee e a bea ad e begg f e fgeaue[Q:1/8=120]"^moderate".GBd | e2 de dc | B>A GE G>B | 
 A2 G2 GA | G6 | g2 gb ag | f>d BA GA | B2 d>f ec | d6 | g2 gb ag | f2 dc BA | G2 GA B/d/e/f/ | 
 g4 (3bag | f2 de dc | B>A GE G>B | A2 G2 GA | G6 |]  