Construct a music composition that complies with the designated structure and theme.
X:1
L:1/8
Q:1/2=100
M:2/4
K:Bb
['F BABc Bdfd cBcd fedc BABc Bdfe', 'B2 cecB Acf z edec f2 c2', 'b2 ff f2 dd d2 BB F4'  
X:1
L:1/8
Q:1/2=100
M:2/4
K:Bb
 F | BABc | Bdfd | cBcd | fedc | BABc | Bdfe | decd | B2 B2 :: cecB | Acf z | edec | f2 c2 | cdcB | 
 Ac f2 | gfga | f4 :: b2 ff | f2 dd | d2 BB | F4 | BABd | cBcd | edcB | A2 F2 | b2 ff | f2 dd | 
 d2 BB | F4 | BABd | cABc | ABcA | B4 :|  