Misc: In what field of study would you find 'flying buttresses'?

Questions

In 1958 Keith ---------- Kutztown Pa, graffiti artist (Vanity Fair, Paris Review), born.?

In 1959 Randy ---------- country singer (Always & Forever), born.?

In 1970 4 students at ---------- University killed by Ohio National Guard during anti-war protest.?

In 1976 ---------- performs their 1st concert.?

In 1979 Margaret ---------- becomes prime minister of England.?