Develop a musical composition in line with the given structure and theme.
X:1
L:1/8
M:4/4
K:Bb
['[DB]4 A>Bc>A [DB]2 B>B B2 c2 d4', 'd>Bd>f e>fg>e c4 |{F} e3 d c>Ac>e'  
X:1
L:1/8
M:4/4
K:Bb
 [DB]4 A>Bc>A | [DB]2 B>B B2 c2 | d4 c>de>c | d2 d>d d3 c | B>AB>c{Bc} d2 cB | A>FA>c f3 c | 
 d/f/=e/f/ e/d/c/B/ A2 TG2 | F2 F>F [CF]4 ::{F} f3 e d>Bd>f | e>fg>e c4 |{F} e3 d c>Ac>e | 
 d>ef>d B3 F | B>dc>e d3 B | d>fe>g f3 e | (3fba{a} (3gfe d2 Tc2 | B2 B>B B4 :|  