Have You Ever Heard Of A Boomwacker?

well neither had I,

until now, American Craig Ramsell reportedly came up for the idea for his boomwhackers in 1994 while at home recovering from radiation therapy, while cutting cardboard tubes into shorter lengths for recycling he happened to notice the different pitches resulting from the different lengths and decided to investigate their creative potential, He experimented with various plastics before settling on plastic mailing tubes, 

Boomwhackers produce musical tones when struck together, on the floor, or against nearly any surface, they can also be grouped together and struck with mallets in different configurations, in specialized holders (homemade or available from the manufacturer), similar to a horizontally-aligned xylophone, when one end of a Boomwhackers tube is covered with what the manufacturer calls an Octavator Cap, the pitch it produces is lowered by an octave, boomwackers, never heard of them, until now that is!