Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/4
Q:1/2=112
M:2/2
K:D
['F G A3/2 B/', 'A F', 'E/ D2 F']  
X:1
L:1/4
Q:1/2=112
M:2/2
K:D
 F G |:"D" A3/2 B/ A F | A2 d e | f3/2 e/ f a | d2 d c |"G" B3/2 c/ d B |"D" A F D F | 
"A7" E2 E3/2 F/ | E2 F G |"D" A3/2 B/ A F | A2 d e | f3/2 e/ f a | d2 d c |"G" B3/2 c/ d B | 
"A7" A F E F |"D" D2 D3/2 E/ | D2 d e ||"D" f3/2 e/ f g | a2 A2 |"G" B3/2 A/ B c |"D" d2 z A | 
"G" B3/2 c/ d B |"G" A F D F |"A7" E2 E3/2 F/ | E2 F G |"D" A3/2 B/ A F | A2 d e | f3/2 e/ f a | 
 d2 d c |"G" B3/2 c/ d B |"A7" A F E F |"D" D2 D3/2 E/ | D2 F G ||  