Which is the hybrid style developed by Christian artists living in Islamic Spain?

Who of the following was NOT a noted singer who garnered fame and popularity during the 1950s?

a) Mel Torme b) Ella Fitzgerald c) Mildred Bailey d) Sarah Vaughn

How is a gendhing named? (See margin note in WOM, p. 224 and description on p.227) and to what do the different parts of the title of CD 2:4 refer?

What will be an ideal response?