Utilizing the provided musical theme and letter-based structure, compose a piece of music.
X:1
L:1/4
M:4/4
K:D
['f e d', 'B B/A/ B c d']  
X:1
L:1/4
M:4/4
K:D
 f/g/ | a f e d | f3/2 f/- f f/g/ | a f e d | B3/2 B/- B f/g/ | a f e d | f3/2 f/- f f/g/ | 
 f e d c | B3/2 B/- B :: B/A/ | B c d c | B3/2 B/- B B/A/ | B c d c | B3/2 B/- B B/A/ | B c d e | 
 f3/2 f/- f f/g/ | f e d c | B3/2 B/- B :|  