Create music using the given musical theme and adhere to the outlined letter-based structure.
X:1
L:1/8
Q:1/8=232
M:4/4
K:Bb
['FB, G/F/E/D/ FB,']  
X:1
L:1/8
Q:1/8=232
M:4/4
K:Bb
|: G | FB, G/F/E/D/ FB, DB, | CD EF GC EG | FB, G/F/E/D/ FB, DF | GB Ac dB B2 | 
 FB, G/F/E/D/ FB, DB, | CD EF GC EG | FB, G/F/E/D/ FB, DF | GB Ac dB B2 | df Bf df e/f/d/c/ | 
 eg cf eg ab | df Bf df e/d/c/B/ | GB Ac dB Bf | df Bf df e/f/d/c/ | eg cf eg ab | fb fd ge cd | 
 FG AB dB B :|  