Cant find a you tube or video but mine is Jupiter from HOLST Planet Suite I also like Ashogans Farewell played by the Royal Marines and as regards vocals I like Andre Bocelli and Sarah Brightman singing Time to ay Goodbye.
John Adams' Short Ride in a Fast Machine. Modern classical, it's the piece that most inspired Goldie when he was challenged to write a score for the Proms following Maestro.
Try this: http://www.youtube.com/watch?v=oSU8MDLJCVM - the most moving item I have ever heard on the internet. The Ashokan Farewell backs up the famous letter from Sullivan Ballou. Sort of puts things in context.....