Cross-Grainger Kangaroo-Pouch Tone-Tool
From MysteryWiki
The Cross-Grainger Kangaroo-Pouch Tone-Tool was a musical instrument designed and developed by Australian composer Percy Grainger. The instrument's construction was completed in 1952, producing a sound which was been described as "four air-raid sirens going on at different pitches."
References
No adequate sources have been found so far.