Craft a musical work based on the specified structure and given theme.
X:1
L:1/8
M:2/2
K:Bb
['f2 dB', 'fB (TB3/2A/4B/4)'  
X:1
L:1/8
M:2/2
K:Bb
 Bc | defg f2 dB | g2 ec f2 dB | Bcde fdBd | c=Bcd c3 _B/c/ | defg f2 dB | g2 ec f2 dB | 
 fbag gfed | fedc B2 :: FG | ABcd cAFA | dBFB cAFA | FGAB cAFA | edc=B c3 _B/c/ | 
 defg fB (TB3/2A/4B/4) | gB (TB3/2A/4B/4) fB (TB3/2A/4B/4) | fbag gfed | fedc B2 :|  