Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/8
Q:1/4=100
M:4/4
K:D
['fg a2']  
X:1
L:1/8
Q:1/4=100
M:4/4
K:D
|:"A7" A |"D" f3 e/d/"A" cd ec |"D" d2 d>d de fg | a2 a>f"A" g>f a>g |"D" f2 d>d d2 g/f/e/d/ | 
"A" c2 c>c cd ec |"D" d2 f2 a3 f |"Em" gb ge"A" d2 c2 |"D" d2 d>d"^fine" d3 ::"A7" A | 
"D" d>e fg a2 a2 |"A" a>b c'd' a3 a | g2 a>g"D" f2 g>f |"A" e2 g>e dc BA |"D" d>e fg a2 a2 | 
"A" a>b c'd' a3 a |"Em" ab ge"A" d2 c2 |"D" d2"^D.C. al fine" d>d d3 :|  