Craft a musical piece in accordance with the designated structure and theme.
X:1
L:1/8
M:4/4
K:D
['d>fb>g a>^ga>f', 'e>dc>B A>GE>G F>Ad>f'  
X:1
L:1/8
M:4/4
K:D
|: f>g | a>^ga>f d>fb>g | a>^ga>f (3ded c>d | e>A (3AAA e>Af>A | e>dc>B A>Af>g | a2 a>f d>fb>g | 
 a>^ga>f d>Ac>d | B>GF>G A>ce>c | d2 f2 d2 :: c>d | e>dc>B A>GE>G | F>Ad>f a2 f>a | 
 (3gag e>g (3fgf d>f | e>dc>B A>Bc>d | e>dc>B A>GE>G | F>Ad>f a>fb>a | g>fe>d c>AB>c | d2 f2 d2 :|  