symphonize
[ sim-fuh-nahyz ]
/ ˈsɪm fəˌnaɪz /
verb (used without object), sym·pho·nized, sym·pho·niz·ing.
to play or sound together harmoniously.
Also
especially British,
sym·pho·nise.
Origin of symphonize
First recorded in 1485–95;
symphon(y) +
-ize