useless trivia: What Word Means: A Plant With Two Seed Leaves?

Questions

This Elton John song was subtitled "Hey Hey Johnny."?

This ex Van Halen member did the song "The Girl Gets Around".?

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"?