Historical clue formulations

• ___ Effect (supposed I.Q. boost from music) — 2018-01-27
• "Idomeneo" composer — 2017-01-08
• According to legend, at age 2 he identified a pig's squeal as G sharp — 2014-09-25
• "Eine kleine Nachtmusik" composer — 2010-05-27
• "La Clemenza di Tito" composer — 2010-04-22
• "The Impresario" composer — 2009-04-25
• "Cosi fan tutte" composer — 2002-04-07
• "The Clemency of Titus" composer — 1999-08-10
• Composer who wrote "The Magic Flute" — 1998-03-02
• "Jupiter" composer — 1996-08-17