If your going back a few years it's probably the Fiat Strada one "Handbuilt by robots...". If it's comtemorary, lilely to be the Citroen Zara Picasso. With the paint robots, trying to imbue a sense of creativity and artistry into a very mundane mass produced car!
I think you do mean the Citreon Xsara Picasso in which case it's: Je Ne Veux Pas Travailler by Pink Martini according to:
http://www.commercialbreaksandbeats.co.uk/
Pink
Martini was the brainchild of classically-trained pianist Thomas M. Lauderdale and vocalist China Forbes; fusing a vast array of influences spanning Cuban jazz to music hall to film scores, the group honed an exotic sound which led to their 1997 debut LP Sympathique.
Hope this helps