Which decorative forms did the architects experiment with in the Córdoba maqsura?

A work's libretto is:

a. the producer's secretary, in charge of hiring and firing b. the text for a sung stage production c. the staging directions all actors must follow d. the lower notes of a musical score

The Thad Jones–Mel Lewis band was known as a "rehearsal" band, which meant that

a. they rehearsed constantly, performing for the public only rarely b. they met only in recording studios, never performing publicly c. they were primarily a backup band for well-known singers like Frank Sinatra d. they met once a week to play through new arrangements at jazz clubs, rather than touring as a group