cats' concert

noun2

1. •
   The cacophony of meows, hisses, and other vocalizations that cats make during a period of social interaction.

   • The feral Siamese have been holding a cats' concert in the night, a maniacal caterwauling that sends a shiver down the spine of every vertebrate on the island, whether quick or dead. — 2000
2. •
   (figurative) Any confusing or intolerable combination of voices.