Mick Jagger and David Bowie intended to perform an intercontinental duet, with Bowie in London and Jagger in Philadelphia. Problems of synchronisation meant the only practical solution was to have one artist, likely Bowie at Wembley, mime along to prerecorded vocals broadcast as part of the live sound mix for Jagger's performance from Philadelphia. Veteran music engineer David Richards (Pink Floyd and Queen) was brought in to create footage and sound mixes Jagger and Bowie could perform to in their respective venues. The BBC would then have had to ensure those footage and sound mixes were in sync while also performing a live vision mix of the footage from both venues. The combined footage would then have had to be bounced back by satellite to the various broadcasters around the world. Due to the time lag (the signal would take several seconds to be broadcast twice across the Atlantic Ocean), Richards concluded there was no way for Jagger to hear or see Bowie's performance, meaning there could be no interaction between the artists, essentially defeating the whole point of the exercise. On top of this, both artists objected to the idea of miming at what was perceived as a historic event. Instead, Jagger and Bowie worked with Richards to create a video clip of the song they would have performed, a cover of "Dancing in the Street", which was shown on the screens of both stadiums and broadcast as part of many TV networks' coverage.