Historical clue formulations

• Cole Porter classic from "Can-Can" — 2016-05-31
• Song lyric before "in the winter when it drizzles" and "in the summer when it sizzles" — 2016-04-06
• Cole Porter tune sung by Frank Sinatra and Maurice Chevalier — 2016-03-31
• "Can-Can" song — 2009-02-14