There will be a major retrospective of Tom Wesselmann's art in Montreal this summer (starting in May 2012)...at the bottom of the attached article you will find the song that Barbara sang with Tom Wesselmann on harmonica - give it a listen...also check out Monica Serra's TW song directly above it....
http://www.artinamericamagazine.com/news-opinion/conversations/2012-04-12/wesselmann/