Compose a piece adhering to the given musical structure and theme.
X:1
L:1/8
M:2/2
K:D
['B |]: A2', 'DAFA GFEF GBdB A2 FA DAFA GBAG', 'gfed cAeA fAed cdef gfeg faeg faeg'  
X:1
L:1/8
M:2/2
K:D
 B |]: A2 FA DAFA | GFEF GBdB | A2 FA DAFA | GBAG FDDB |"^variation" AF F2 DFAF | GE E2 GBdB | 
 AD D2 ADFD | GEAG FDDB :: Addc d3 A | (3Bcd ef gfed | cAeA fAed | cdef gfeg | faeg faeg | 
 fddc defg | afge fdec | dBAG FDDB :|  