As the title suggests. For me it will always be the one by Bear McCeary from the Battlestar Galactica soundtrack. It is modernised.
For reference the term in music is the ¾ walk (spanish/italian), aka what we today call the Waltz.
I've listened to others however and some are bloody good as well. Indeed I just listened to one from the 17th century (played by 20th century – aka 1997 musicians of course!), and it's also now a favourite.
So, what is your favourite?
I didn't find the right solution from the Internet.
References:http://forums.whirlpool.net.au/forum-replies.cfm?t=2562395