How is repetition used in the Yeibichai song?

For what occasion was Verdi's Aida commissioned?

a. the opening of the Suez Canal b. Egypt's independence from Great Britain c. the commemoration of the Italian independence movement d. the death of Wagner

What is the most important of Debussy's musical innovations in "En sourdine" from Fêtes galante I?

a. lack of melody b. metrical ambiguity c. harmonic language d. vocal timbre