Doctor Who first aired on the BBC in 1963, and its theme was composed by Ron Grainer and realised electronically by Delia Derbyshire at the BBC Radiophonic Workshop. The closing version played over the end credits, often after a cliffhanger, using tape loops and oscillators long before synthesisers were common. Different arrangements have returned with each new era of the show, but the core melody and bassline remain unchanged. Fans still reuse the closing theme online to signal a dramatic exit, a time travel gag, or a love of classic British sci fi.