What is what key is bari sax in?

The baritone saxophone is typically in the key of Eb (E-flat). This means that when a baritone saxophone player reads a C on sheet music, they will actually be playing an Eb note on their instrument. The baritone saxophone is a large instrument with a deep, rich sound that is often used in jazz ensembles and marching bands. It is a versatile instrument, capable of playing both high and low notes with ease.