Which children's TV host famously wore cardigan sweaters and sang "Won't You Be My Neighbor?"

In 'Sesame Street', which Muppet lives in a trash can? In 'Sesame Street', which Muppet loves cookies? In 'Sesame Street', what color is Elmo? Who created 'The Muppet Show'? Which TV painter was known for his "happy little trees"? Which children's series featured host LeVar Burton encouraging kids to read? Which long-running NBC sketch comedy show premiered in 1975? Who created 'Saturday Night Live'?