Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/4
M:4/4
K:D
['A F E2 D C']  
X:1
L:1/4
M:4/4
K:D
 A | D D F A | B B A F | E2 D C | D3 A | d2 d c | B2 c d | e A A ^G | A2 (B c) | d2 d F | 
 G/ G3/2 G A | B B B3/2 F/ | A3 A | D2 F A/A/ | B2 A F | E2 D C | D3 ||  