Yes are an English rock band formed in London in 1968 by singer Jon Anderson and bassist Chris Squire. The band has undergone numerous formations throughout its history; nineteen musicians have been full time members. Since June 2015, it has consisted of guitarist Steve Howe, drummer Alan White, keyboardist Geoff Downes, singer Jon Davison, and bassist Billy Sherwood. Yes adopted several changes in musical style, from rearranged covers to progressive and art rock in the 1970s, before moving towards pop in the 1980s. They have sold 13.5 million RIAA-certified albums in the US.