"Hey Jude" was the first Beatles song to be recorded on eight-track equipment. Trident Studios were paid £25 per hour by EMI for the sessions. Sheffield said that the studio earned about £1,000 in total, but by having the Beatles record there, and in turn raving about the facility, the value was incalculable. The band carried out further work at Trident during 1968, and Apple artists such as Lomax, Mary Hopkin, Billy Preston and the Iveys all recorded there over the next year.