concerted piece

from The Collaborative International Dictionary of English v.0.48

Concerted \Con*cert"ed\, a.
   Mutually contrived or planned; agreed on; as, concerted
   schemes, signals.
   [1913 Webster]

   {Concerted piece} (Mus.), a composition in parts for several
      voices or instrument, as a trio, a quartet, etc.
      [1913 Webster]