A steel rod bent into the shape of an isosceles triangle, this is a young person's percussion instrument.

Not because a child can play it (although a child can) but because it rings in the frequency range that older listeners tend to lose. One corner of the triangle is left open to keep the instrument from having a specific pitch and to allow it to generate ethereal, scintillating overtones instead. They are the secret of its glitter. When jangled with a metal beater, the triangle raises the energy level. It is very good for suggesting dance.

Fact File

Did you know?

The first prominent orchestral appearance of the triangle is in Franz Liszt's Piano Concerto No.1, from 1849.