The following two vids contain two pieces of music that are among my best-loved. The first is quite recent, a waltz written by Eugene Doga, a Moldavian composer, for a Russian movie 'My tender and sweet beast.' I think it is my favourite waltz ever.
The second is a finale of 1812 overture by Tchaikovsky. I loved the whole overture even before I got into the whole Napoleonic Wars thing. ^_^ Wikipedia had a very good summary of the overture's plotline, which I'm posting as well, with the bit relevant for the finale highlighted.
( Music here )