In a mosque, what form is used to mark the building's location and allow the faithful to be called to prayer?

What is it called when a musician spontaneously adds or changes chords while performing a tune?

a. Call and response b. Substitution c. Sampling d. Syncopation

The lack of emphasis on backbeats and simple rhythmic background in "That's All Right" suggest which influence?

A) rhythm and blues B) gospel C) country D) psychedelic rock