This uncertainty has continued until the present day. Gibbons’s 8-part full anthem, "O clap your hands" was sung on 17 May 1622 at the degree ceremony for William Heather. Heather had financially supported William Camden's creation and maintenance of the Camden Professor of Ancient History chair and in return the university awarded him the honorary degrees of bachelor in music and doctor of music, even though he was not known to be a musician. The author Sir John Hawkins and musicologists Edmund Fellowes and David Mateer state unequivocally that Gibbons was awarded a doctorate along with Heather, and cite "O clap your hands" as the composer’s qualifying exercise for the degree. Other musicologists – Peter Le Huray, John Harper and John Harley – express some doubt whether Gibbons received a doctorate. Specifically, Harley cites a record in the Cheque book of the Chapel Royal that refers to William Heather as "doctor" but Gibbons as "senior organist." The same writer refers to a letter from Camden to William Piers from 18 May 1622 that says Gibbons is a Doctor of Music. Harley suggests that the authenticity of the letter is uncertain, since the original does not survive; he suggests that Camden could have written something such as "G––––s," which an editor assumed to mean Gibbons. The most convincing piece of evidence is thought to be the absence of mention of the supposed doctorate of music on Gibbons's Cambridge monument, erected in his memory when he died. Although the existing evidence seems to support the conclusion that he never achieved a doctorate in music, there is no indisputable evidence to confirm it.