Craft a musical work based on the specified structure and given theme.
X:1
L:1/16
M:2/4
K:Bb
['B2dB BFDF B2dB', 'DFBF EGFE'  
X:1
L:1/16
M:2/4
K:Bb
 F2 | B2dB BFDF | B2dB ecAc | Bcde fdcB | ABcd cAFD | B2dB BFDF | B2dB ecBA | Bcde fdcA | B2B2B2 :: 
 c2 | ffff ffaf | gggg ggbg | gecc cdcB | ABcd cAF_E | DFBF EGFE | DFBF EGFE | DFBd cdcA | 
 B2B2B2 :|  