While fretless basses are often associated with jazz and jazz fusion , bassists from other genres have always used fretless basses , such as Freebo ( country ) , Rick Danko ( rock\/blues ) , Rod Clements ( folk ) , Steve DiGiorgio ( metal ) , Colin Edwin ( modern\/progressive rock ) .
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 ) .