The merry dancers

from The Collaborative International Dictionary of English v.0.48

Dancer \Dan"cer\, n.
   One who dances or who practices dancing.
   [1913 Webster]

   {The merry dancers}, beams of the northern lights when they
      rise and fall alternately without any considerable change
      of length. See {Aurora borealis}, under {Aurora}.
      [1913 Webster]