well I'll have a bash at a few.
600-700 is True. Caedmon is the fellow concerned.
1200-1300 is False. It refers to "Summer is icumen in", but it's in 6 parts, not four.
1700-1800 is True, referring to John Gay's "Beggar's Opera".
1600-1700 is False. The dance was maybe published AS Sir Roger de Coverley, but not BY Sir Roger de Coverley, for a guess.