clam bake

a lously musical performance full of sour or mispitched notes.

Dude #1: Did you hear the band concert last night?

Dude #2: Yeah- it really sucked. What a friggen clam bake.

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rant

The ugly and distorted sound of two notes, an octave apart, coming out of a brass instrument (such at a trombone or french horn), by accident, at one time.

The Solti Bruckner 4th Symphony recording with the Chicago Symphony contains a clearly audible rant on the unison low C-flat in the trombones

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cack artist

A musician (usually a trumpet player) who has a reputation for prominently "cacking" (mispitching) notes on performances thereby bringing down the quality of the overall performance.

Did you hear that guy!?! I'm never hiring him again- fucking cack artist.