In the 1960s and 1970s some musicians took the frets off their bass guitars. This changes the sound of the bass, particularly as the player slides their fingers along the strings. A bass guitar without frets is called a fretless bass guitar. For example Pino Palladino played a fretless bass during the 1980s. He was a session musician, playing for high profile musicians like Eric Clapton and David Gilmour. While fretless basses are often used in jazz and jazz fusion, bassists from other genres use fretless basses, such as metal bassist Steve DiGiorgio and Colin Edwin of modern/progressive rock band [Porcupine Tree].