Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
M:3/4
K:Bb
['BdB d2 f fed BdB', 'fed BdB'  
X:1
L:1/8
M:3/4
K:Bb
 BdB | d2 f | fed | BdB | edc | B3 :| cde | f2 g | fed | BdB | dde | c3 | BdB | d2 f/g/ | fed | 
 BdB | edc | B3 |]  