music: 60's Chart Toppers: Name The Artist: 'Til?

Questions

This former ac/dc member died on february 19, 1980?

This group has recorded covers of The Beatles classics "come together", "i am the walrus", "helter skelter", "help" & "day tripper"?

This group name suggests an unpleasant February 14th.?

This group, not Joni Mitchell, recorded the song "One Tin Soldier"?

This group's 2nd biggest hit, "Gold", hit the charts in 1984.?