Tattie Bogle mentioned Andres Segovia's solo guitar recitals.

I heard one such recital around 1980, when he was near the end.
There were three categories of repertoire on the program:
old classics, like Bach, arranged for guitar by Segovia;
guitar music rescued from oblivion largely by Segovia;
and pieces that were commissioned for world premieres by Segovia.
So the whole program was intended to represent Segovia as an historical phenomenon in his own right, in classical music.

The concert was uneven, actually.
Segovia suffered a memory lapse in one long segment of the program, and struggled visibly to pick up the threads of the music.
It was during a long cycle that had been commissioned by him, and
plainly he had not performed it that often.

But, as the Tattie Bogle post points out,
Segovia had no shortage of encores with which to entertain the audience,
and in these he felt right at home and delivered them easily.
It was one of the most memorable concerts of my life, as Tattie Bogle's evening must have been one of hers.