Historical clue formulations

• Plays for time, in a way — 2021-06-23
• Extemporizes — 2021-05-23
• Improvises — 2008-02-17
• Soloists' lead-ins, maybe — 2000-11-02
• Improvises — 2000-04-15
• Jazzy riffs — 1999-12-09
• Minxes — 1998-10-13
• Improvises chords — 1998-05-10
• Improvises on the piano — 1995-05-11
• Bara and Negri — 1993-12-28