Misc: what is the theme song for the tv series "arthur godfrey and his friends"??

Questions

In 1945 Franklin D. Rooseveldt dies of a ---------- in Warm Springs, Ga.?

In 1947 David ---------- , late night television talk show host, born.?

In 1950 David ---------- , Shirley Jones' kid on TV and real life, born.?

In 1961 Yuri A. Gagarin becomes first man to orbit Earth aboard ---------- 1.?

In 1979 ---------- 33 returns to Earth.?