The Swedish Radio Symphony Orchestra perform Debussy, Ravel and Saint Saens.
Back in the day, Beethoven would have concerts of his own music to get it out into the world. While not quite the same thing (those original concerts were three to four to five hours long), it's great to hear his 6th and 7th back to back.
It doesn't get much better than this. The BSO at Carnegie Hall. Prepare for perfection!
If any piece of music could be compared to a mountain, this would be a strong candidate. Bruckner's sweeping Symphony No. 9 takes us to heights of size and grandeur.