1. Audio. From http://hyperphysics.phy-astr.gsu.edu/Hbase/sound/soucon.html: 2a. General. To throw or toss. Antonym: catch. 2b. Colloquially, to dispose of as refuse. "Pitch those worn-out costumes--we'll never use them again." 3. From airplane terminology: pitch, roll, and yaw. Pitch is the tilt, or angle off horizontal, of an object. 4. A sales presentation proposal to impress a potential client. "For the pitch we'll need photo-realistic WYSIWYG renderings of the set and lights to show the band." 5. Ratio of rise over run. A roof with a 4:12 pitch will have a vertical rise of 4 inches for every horizontal run of 12 inches. The angle of the roof would be Inverse Tangent (4/12) or ~18°.