Musician in Common: Musician in each of: current Rush, but NOT original Rush?

Questions

Which radio 2 presenter once had a hit with a single called The Man form Laramie?

Which plant does this describe - leaves in equal pairs,dull purple flowers and black,cherry sized berries?

What is the correct name for a gazebo on the roof of a house?

Which province provides 25% of Canadas agricultural income?

What hi fi innovation was a spin off from the ill fated laser video?