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
["a^ga bc'd'", 'f Add fdd add']  
X:1
L:1/8
M:6/8
K:D
 a^ga bc'd' | a^ga bc'd' | aba agf | fee efg | a^ga bc'd' | a^ga bc'd' | aba gfe | fdd d2 :: f | 
 Add fdd | add fdd | faa agf | gee e2 f | Add fdd | add fed | faa a2 g | fdd d2 z :|  