Craft a music piece according to the prescribed structure and the input theme.
X:1
L:1/8
M:2/2
K:D
['dF F2', 'fa a2 baaf afeg', 'ABdf gfeg fdec dF F2 ABdB AFDF', 'fa a2 ba a2 afea'  
X:1
L:1/8
M:2/2
K:D
 dF F2 ABdf | gfeg fdBc | dF F2 ABdB | AFDF EF D2 :| faaf afdf | gfed cdeg | fa a2 baaf | 
 afeg fdde | fa a2 baaf | afeg f3 e | dF F2 ABdf | g2 eg fdec |:"^variations" dF F2 ABdf | 
 gfeg fdec | dF F2 ABdB | AFDF EF D2 :| fa a2 afdf | gfed Bcde | fa a2 ba a2 | afea fdde | 
 fa a2 ba a2 | afea f3 e | dF F2 ABdf | gfeg fdec ||  