The term 'choir voices' refers to the different vocal ranges that make up a choir. The five main vocal ranges are bassi (5 letters), altos (5 letters), alti (4 letters), tenors (6 letters) and basses (6 letters). Bassi is the lowest vocal range, followed by altos, alti, tenors and basses in ascending order. Each of these vocal ranges has its own unique sound and contributes to the overall sound of the choir.