Madonna has asked her fans to select the tracks for her next greatest hits album.
The singer's manager Guy Oseary has used social networking site Twitter.com to find out which songs should be included.
He writes, "Working on Madonna's greatest hits album. Any tracks that you think MUST be on?"
Madonna's untitled swansong album is tentatively set for release in September and follows her 1990 compilation Immaculate Collection and 2001's GHV2.