Historical clue formulations

• Singer with the 2012 #1 hit "Somebody That I Used to Know" — 2019-12-27
• "Somebody That I Used to Know" singer, 2011 — 2019-02-06
• Singer of the 2012 #1 hit "Somebody That I Used to Know" — 2017-11-28
• Singer with the 2012 #1 hit "Somebody That I Used to Know" — 2017-10-29