Construct a musical piece by amalgamating the designated alphabetical representation and the supplied musical theme.
X:1
L:1/4
M:none
K:D
['B A']  
X:1
L:1/4
M:none
K:D
 D G | A3 =c B A2 A | B3 B |"^(a)" A F/ F/ D F | A2 A2 | B A F3 D E D | F3 F A B | 
 A3 (B/A/) F (E/D/) | D3 |]"^(a)" A F F D | F |]  