What is the lowest pitch part of the music?

The lowest pitch part of music is typically referred to as the bass. In a musical composition, the bass provides the foundational tones and harmonies, often played by instruments such as the Bass Guitar, cello, or tuba. It establishes the harmonic framework and adds depth to the overall sound. In vocal arrangements, bass refers to the lowest male voice type, which contributes to the richness of choral music.