In both series, I found the signature tune quite hypnotic, but I had no idea what language, or combination of languages was involved. Yes, a few English words could be detected at the end of the bit used in the TV programme.
This is a live performance I found on YouTube, so I expect not identical to what they used on the TV prog.
(To switch to full screen, click the Full screen icon in the bottom corner of the video player.
To exit out of full screen, press Esc on your keyboard or click the Full screen icon again.)
http://www.midsummerseve.com/fora/threa ... 398&page=2