Craft a musical work adhering to the specified theme and structure.
X:1
L:1/8
Q:3/8=108
M:6/8
K:Bb
['B>cB FDF', '(db)b (ca)a (Bg)g (Af)f gfe dcB'  
X:1
L:1/8
Q:3/8=108
M:6/8
K:Bb
|: B>cB FDF | B>cB FDF | BFB dBd | fgf edc | B>cB FDF | B>cB FDF | BFB dBd | c>Bc B3 :: 
 (db)b (ca)a | (Bg)g (Af)f | gfe dcB | AcB AGF | (db)b (ca)a | (Bg)g (Af)f | gfe dcB | FGA B3 :|  