John Tielli is a Canadian musician based in Montreal. He is a current member of the Hydrothermal Vents and formerly of Metal Kites and CLARK the band. He was also a member of People from Earth and Rock Plaza Central, as was his brother Doug Tielli. Tielli is also a brother to musician Martin Tielli. John plays theremin on volume one of Martin's 2009 album, The Ghost of Danny Gross.