Historical clue formulations

• Ostensible composer of "The Abduction of Figaro" and "Oedipus Tex" — 2008-03-01
• Pseudonym of musician Peter Schickele — 2006-03-26
• Composer of "Oedipus Tex" and "A Little Nightmare Music" — 2004-11-28
• Peter Schickele's alter ego — 1996-08-11