Craft a music piece according to the prescribed structure and the input theme.
X:1
L:1/8
Q:1/2=90
M:4/4
K:Bb
['B2 df']  
X:1
L:1/8
Q:1/2=90
M:4/4
K:Bb
 f | edcB B2 df | gfdf gabf | (ed)cB B3 d | cAFA cdef | edcB B2 df | gfdf gfga | b2 bf edcB | 
 Afcf dfcf | B2 df bfdf | bfdf bfdB | F2 Ac fg=eg | fg=eg fcAF | B2 df bfdf | bfdf bfdB | 
 e2 d2 c2 B2 | FGAB cd"^DC"ef |]  