What umbrella organization, chartered by the U.S. Congress in 1956, serves the interest of commercial and noncommercial music associations in the United States?

The concertino is:

a. synonymous with ritornello. b. the large ensemble in a concerto grosso. c. a short concerto for violin and basso continuo. d. a small group of soloists in a concerto grosso.

Which ancient building technique could enclose the largest volume of space using the least amount of material?

a)  a dome on pendentives b)  a barrel vault c)  an arcade d)  a groin vault