Any element of music (rhythm, melody, or harmony) that continually repeats is called ____________

If a jazz composition uses the "rhythm changes," this means that

a. it changes time signatures in the middle of the piece b. it uses a famous rhythm pattern from Gershwin's tune "I Got Rhythm" c. it uses the chord changes from the Gershwin tune "I Got Rhythm" d. it uses the harmonies from the Gershwin tune "Fascinating Rhythm"

The two centuries of peace that began under the reign of Augustus is generally called the_____

a. tetrarchy b. soldier emperors c. Pax Romana d. senate