Historical clue formulations

• Like many old fiddle tunes: Abbr. — 2023-08-16
• Like much folk music: Abbr. — 2018-01-31
• Like many folk songs: Abbr. — 2017-04-22
• Like much folk music: Abbr. — 2011-07-26
• Frequent abbr. on sheet music for folk songs — 2007-04-29