There are three artists who go by the name Doctor.

(1) A London-based grime/UK hip-hop MC, part of the South Agents crew.

(2) Canadian rock band with vocalist Danny Greaves (The Watchmen) and Rob Higgins (Change Of Heart, The Royals) on bass. The duo met while Higgins was subbing in for several of The Watchmen's shows. Their album High Is As High Gets, featuring the single What Makes You Think He's Lucky was released in 2004. Currently, the band appear to be on hiatus.

(3) Experimental electronic musician based in California. Their music can be found at https://dogtor.bandcamp.com/.
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