 The title song was originally to be "Mr. Kiss Kiss Bang Bang" sung  by Dionne Warwick (qv), but was changed at the last minute to  "Thunderball" sung by Tom Jones (I) (qv). Four different versions  of the song were recorded, including a version sung by  Shirley Bassey (qv) and two different instrumental versions; the  two instrumental versions were eventually released on disc, while  Dionne Warwicks version was used in the opening credit sequence of  an unreleased version of the film. This version can be heard on  Audio Commentary Track Two on the DVD during the opening titles.