Craft a musical piece in accordance with the designated structure and theme.
X:1
L:1/8
Q:1/4=100
M:4/4
K:D
['a/g/f/e/ dc d2 A>d', 'dd/d/ dd/d/'  
X:1
L:1/8
Q:1/4=100
M:4/4
K:D
 f/g/ | a/g/f/e/ dc d2 A>d | g2 g/b/a/g/ f2 ef/g/ |"^3" a/g/f/e/ dc d2 A>d | c>A BA/B/ A3 || c/d/ | 
"^5" ee ef g2 gf | b>a b>[ac'] b>a gf |"^7" bf fe/f/ g2 fe | dB d/c/B/A/ B3 f/g/ | 
"^9" a/g/f/e/ dc d2 A>d | g2 g/b/a/g/ f2 e>A |"^11" dd/d/ dd/d/ dd/d/ fa | dd/d/ dd/d/ dd/d/ fa | 
"^13" dd/d/ fa dd/d/ fa | b/a/g/f/ ba g2 f>d |"^15" e>f g/f/e/d/ cB/c/ A>g | fg/a/ A>g fg/a/ A>g | 
 fg/a/ Ac d4 |]  