In 1961, which African-American soprano made her Metropolitan Opera debut as Leonora in "Il trovatore"?

In 1949, Bing Crosby played which title New Englander who travels back to a time of knights and ladies? In 1949, who wrote "If you want a picture of the future, imagine a boot stamping on a human face, forever"? In November 1950, U.S. pilot Russell Brown in an F-80 was credited with shooting down which type of Soviet-built jet? In 1959, which spiritual leader of Tibet fled into exile in India? In 1962, which country swapped 1,113 prisoners it had captured in the Bay of Pigs invasion for $53 million in aid? In 1963, a "hot line" emergency link went into effect between Washington, D.C., and which world city? In 1963, the Four Seasons sang about being "happy as can be" with which sweet "Girl"? In 1966, which St. Louis structure won the American Institute of Architects' Henry Bacon Medal?