Which term refers to adapting music for choir performance considering vocal ranges?

The term that best refers to adapting music for choir performance while considering vocal ranges is choral arrangement. A choral arrangement involves taking a piece of music and restructuring it to suit the specific parts of a choir, which typically include soprano, alto, tenor, and bass voices. This process ensures that each section of the choir can sing the music comfortably within their vocal range and blends well to produce a harmonious sound.

In contrast, vocal registration pertains to the different ranges and qualities of a singer's voice, such as chest voice and head voice, rather than how music is arranged for a group. Counterpoint refers to the relationship between independent melodies, which is a distinct concept not directly focused on choir arrangements. Ostinato refers to a repeated musical phrase or rhythm, which is also not specific to the adaptation of music for choir. Thus, choral arrangement is the most accurate term for the context of adapting music for choir performance.