Compose a musical piece in accordance with the outlined theme and structure.
X:1
L:1/8
Q:1/8=232
M:4/4
K:Bb
['f=e fg', 'Af =ef df Bf'  
X:1
L:1/8
Q:1/8=232
M:4/4
K:Bb
|: F2 | BA Bc Bc de | f=e fg fd Bd | f=e fg fd cB | Ac BG Fe dc | BA Bc Bc de | f=e fg fa gf | 
 =ef ga bg eg | fc ag f2 :: cB | Af =ef df Bf | Af =ef df Bf | gf ed ed cB | Ac BG F2 GA | 
 Bf dB Ae cA | Bf dB Ae cA | Bb ag (3(fgf) (3(edc) | B2 b2 B2 :|  