Personnel changes were made over the years, with Curtis and Allison remaining relative constants. For the 1971 album "Rockin' 50s Rock n' Roll" (which consisted mostly of remakes of Holly-era material), the group consisted of Curtis, Allison and Doug Gilmore. For the 1973 album "Bubblegum, Bop, Ballad and Boogies", the lineup featured Curtis, Allison, Hardin and bassist Ric Grech. Steven Krikorian, later to record as the new wave artist Tonio K., joined the group as a vocalist shortly thereafter, as did guitarists Albert Lee and Nick van Maarth, replacing Hardin. The 1973 album "Remnants" and the 1974 album "A Long Way from Lubbock" featured the sextet of Allison, Curtis, Krikorian, Grech, Lee and van Maarth.