 The ABC was one of the first television networks to embrace the rock'n'roll revolution of the late 1950s, most notably with "Six O'Clock Rock", hosted by Johnny O'Keefe.During the 60s and early 70s the ABC continued to produce programs on popular music, including the pop show "Hitscene", performance specials by groups such as Tully and Max Merritt & The Meteors, as well as the magazine-style program "GTK", which premiered in 1969 and screened for 10 minutes, four nights per week at 6.30pm, immediately prior to Bellbird and the 7.00pm news bulletin.Although it was long thought that most of this priceless material had been erased – much like the BBC, an "economy drive" undertaken in the late 1970s led to the erasure of large amounts of videotaped material, including most of the first two years of "Countdown".