Misc: who were named "the canadian ambassadors of rock" in 1979?

Questions

What was a symbol of welcome in the 1700's to 1800's & can often be seen on doorknockers today?

What was Alan Sheppard's ship?

What was David Miller the first person to be arrested for burning, in 1966?

What was Huddie Ledbetter's professional name?

What was invented after a researcher walked by a radar tube & a chocolate bar melted in his pocket?