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:Emin
['Bege BAGA', 'e B3 efgf e c3 efge']  
X:1
L:1/8
M:4/4
K:Emin
|: Bege BAGA | Bege fgfe | Bege BAGA | BcBA GE E2 :: e B3 efgf | e c3 efge | f d3 f d3 | 
 fdad bdad | e B3 efgf | e c3 efge | efge fgaf | gfed e4 :|  