symphonize

from WordNet (r) 3.0 (2006)

symphonize
    v 1: play or sound together, in harmony [syn: {symphonize},
         {symphonise}]

from The Collaborative International Dictionary of English v.0.48

Symphonize \Sym"pho*nize\, v. i. [imp. & p. p. {Symphonized}; p.
   pr. & vb. n. {Symphonizing}.]
   To agree; to be in harmony. [R.] --Boyle.
   [1913 Webster]