music: 80's Chart Toppers: Name The Artist: 9 To 5?

Questions

This female musician wants you to "sing her a happy song"?

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"?