Develop a musical composition in line with the given structure and theme.
X:1
L:1/8
M:2/4
K:Bb
['(3[DB][DB][DB] [DB]2', '[Fc]2 (3cde'  
X:1
L:1/8
M:2/4
K:Bb
 (3[DB][DB][DB] [DB]2 | (3[DB][DB][DB] [DB]2 | b z a z | Tg3/4f/g/ f2 | (3[DB][DB][DB] [DB]2 | 
 (3[DB][DB][DB] [DB]2 | (3edc (3BcA | [DB]2 [DB]2 :: [Fc]2 (3cde | (e2 d).f | (3fgf (3fed | d2 c2 | 
 [Fc]2 (3cde | d2 (3bag | (3fgf (3edc | B2 B,2 :|  