Piano music used for the Series 2 trailer

It is begin the beguine, I must have seen the trailer at the same time as you last night as I was trying to find out who it was! I think it is Juan Esquivel (although I did think it was Liberace to begin with). I couldn't find the song anywhere until I stumbled across this website:
http://heidolicious.blogspot.com/2005_10_30_heidolicious_archive.html

The MP3 file is embedded within the webpage so there's no option to save it straight off although you it will download the MP3 file to your temporary internet files folder in c:\documents and settings!!!!

hope that helps!