Definition
Double bassoon is yet another name for the contrabassoon! It's a descriptive term referring to the instrument's pitch being an octave lower than the regular bassoon, essentially 'doubling' the bass range. It's the same big instrument with the deep, rumbling sound. The term highlights the relationship in pitch between it and the standard bassoon. It's just a different way of emphasizing its role as the 'bassoon's bassoon'.