Original: While fretless basses are often associated with 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.
Simplified: While fretless basses are common with 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).