Joe Henry feat. Madonna: Guilty By Association
Info: Madonna teamed up with brother-in-law Joe Henry for this contribution for the benefit album "Sweet Relief II". The "Sweet Relief Music Fund" is a non-profit organisation which raises funds for musicians with medical and financial hardship.
According to a MTV interview, Joe Henry convinced Madonna to do this duet, after he had "lured her over with her sister's fantastic anchovy pasta".
Source: mad-eyes.net