From November 1973 to September 1974, the band toured North America and Europe which included a headline spot at the inaugural California Jam Festival on 6 April 1974 at the Ontario Motor Speedway in Ontario, California, to an attendance of 250,000 people. Their performance was broadcast across the US. The band's live shows exhibited an unorthodox mix of virtuoso musicianship and over-the-top performances which received much criticism. Their theatrics included Emerson playing a piano as it spun, suspended, end-over-end; Palmer playing on a rotating drum platform; and a Hammond organ thrown around the stage to create feedback. Emerson often used a knife, given to him by Lemmy Kilmister who had roadied for the Nice, to force the keys on the organ to stay down. Emerson used a large Moog modular synthesizer on stage but it was unreliable as heat affected its sound. The band carried almost 40 tons of equipment for the tour. Performances from the band's 1973–74 tour were documented in the live album, "Welcome Back, My Friends, to the Show That Never Ends ~ Ladies and Gentlemen", released in August 1974 as a triple LP. The album peaked at No. 5 in the UK and No. 4 in the US.