Write a musical work incorporating the specified theme and letter-based framework.
X:1
L:1/4
M:4/4
K:D
['d f f2 e g g2 f/a/f/d/', 'g g2']  
X:1
L:1/4
M:4/4
K:D
 d f f2 | e g g2 | f/a/f/d/ e c | d2 D2 :: f a a g/a/ | b g g2 | e g g f/g/ | a f f2 | d f f2 | 
 e g g2 | f/a/f/d/ e c | d2 D2 :|  