Come to think of it, Phish or Grateful Dead live shows have some overlap, but that's more about recordings on different dates by the same artist, while classica

Come to think of it, Phish or Grateful Dead live shows have some overlap, but that's more about recordings on different dates by the same artist, while classical adds different artists, or sometimes the same artist on different dates, or sometimes the same orchestra but a different conductor, or... But yes, that's the closest I can think of, but I think it's a smaller niche even than classical music.