Music Term: (Ger.) - Clef.?

Questions

In 1965 Israel & ---------- exchange letters beginning diplomatic relations?

In 1972 Paul McCartney & ---------- release "Mary Had a Little Lamb"?

In 1977 1st ---------- concert (Pink Floyd in London)?

In 1982 ---------- Portugal, a Spanish priest with a bayonet is stopped prior to his attempt to attack Pope John Paul II?

In 1984 South African prisoner ---------- sees his wife for 1st time in 22 years?