Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/8
M:6/8
K:D
['d3 e3 f3', 'd2 f a2 a agf g2 g']  
X:1
L:1/8
M:6/8
K:D
 uA | d3 e3 | f3 f2 g | aba agf | f3 e2 A | d3 e3 | f3 a2 g | fgf ede | d3- d2 :: f | a2 a agf | 
 g2 g g2 e | fga agf | f3 e2 A | d3 e3 | f2 g a2 g | fgf ede | d3- d2 :|  