American musical theatre in the late 1980s was dominated by productions from what country?

Jukebox musicals based on the songs of which of the following performers have been successful on Broadway?

a. Elvis Pressley b. Johnny Cash c. John Lennon d. Frankie Valli and The Four Seasons e. a and d

Philippe de Vitry is associated with all of the following rhythmic innovations EXCEPT?

a) increased use of minim and semiminim b) use of red ink to indicate imperfection c) use of triple meter instead of duple meter d) mensuration signs