I’ve been looking around on the homepage of the Chamber Orchestra of Europe when I found a video about the rehearsal of Smetana’s Ma Vlast with Nikolaus Harnoncourt:
It was not only extremely illuminating but also very-very funny! The only drawback might be that it is partly in German.
Here are two excerpts from the concert – it is very interesting to listen to it after you “took part” in the rehearsal:
And a link to the whole work, with the same conductor but another orchestra: