Harrison's workload ensured that he was rushing to finish "Dark Horse" in October 1974 before beginning his North American tour with Shankar on 2 November. Described by Leng as "growled", Harrison's rough-sounding singing on "Ding Dong" shows the effects of a long-standing throat problem. Due to a combination of overexertion and abuse, this condition worsened,&lt;ref name="Cavanagh/Uncut"&gt;David Cavanagh, "George Harrison: The Dark Horse", "Uncut", August 2008, pp. 43–44.&lt;/ref&gt; leading to him contracting laryngitis as he simultaneously completed his vocals for the album in Los Angeles and rehearsed for the tour. The female backing singers on the track remain uncredited.