As opposed to what some might think, "Dock of the Bay" was actually to be Redding's next single and worked on it just a few days before his death. The whistle at the end was speculated to be there because he forgot the next verse. However, Steve Cropper who co-wrote the song and Otis, and played the distinctive guitar part has said that there was a spoken word part and he had forgotten the words. In either case, the decision was made to leave it there, which ended up making the perfect ending to the song.