The musical saw is an instrument that was invented and became popular in the end of the 19th century. The definite origin is unclear.
With the very right technique and a violin bow - or by hitting the blade with a mallet - it is possible to elicit wonderful sounds out of the saw.
Depending on the type of the saw and savvy of the musician, up to three octaves can be played. But just on particular saws, specifically made for music.

Used with style and dignity, a saw can even be gazed at in works of distinguished composers.