Which instrument did Clark Terry help to popularize?

Which music of the 6th century became a major part of Catholic Church services?

A) sonatas B) Gregorian chants C) concertos D) madrigals

When should audio be recorded with the video?

A) only when proper release forms have been signed B) only when a boom mic is available C) only when a sound engineer is available D) only when ambient levels are low E) always