Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
M:2/4
K:Bb
['B/A/B/c/ dd B/A/B/c/ d2', 'ffdd bb', 'd3 e fgab g2 g>g']  
X:1
L:1/8
M:2/4
K:Bb
 F | B/A/B/c/ dd | B/A/B/c/ d2 | f/e/d/e/ cc | f/e/d/e/ cc | B/A/B/c/ dd | B/A/B/c/ d2 | 
 e/g/f/e/ d/c/B/A/ | BBB :: d/e/ | ffdd | bb f2 | f/e/d/e/ cc | f/e/d/e/ cc | ffdd | bb f>e | 
 d/g/f/e/ d/c/B/A/ | BBB :: f/e/ | d3 e | fgab | g2 g>g | g2 g/f/e/d/ | c3 d | ecfe | d2 d>d | 
 d2 f>e | d3 e | fgab | g2 g>g | g3 g | fbag | fedc | B2 B>B | B3 :|  