 Numerous examples show influence in the opposite direction, including popular songs based on classical music, the use to which "Pachelbel's Canon" has been put since the 1970s, and the musical crossover phenomenon, where classical musicians have achieved success in the popular music arena.In heavy metal, a number of lead guitarists (playing electric guitar), including Ritchie Blackmore and Randy Rhoads, modeled their playing styles on Baroque or Classical-era instrumental music.Composers of classical music have often made use of folk music (music created by musicians who are commonly not classically trained, often from a purely oral tradition).