Historical clue formulations

• Singing voice meaning "heavy-sounding" — 2021-12-21
• Sinatra, for one — 2017-04-30
• Bing Crosby or Frank Sinatra, voicewise — 2013-07-16
• Figaro in "The Barber of Seville," e.g. — 2012-12-30
• Military band piece — 2010-12-11
• Voice between tenor and bass — 2009-06-08
• Frank Sinatra, for one — 2000-10-14
• Figaro in "The Barber of Seville" — 1995-05-07