貝(bei)(bei)斯是樂(le)隊中(zhong)(zhong)一(yi)般必不可少的樂(le)器之(zhi)一(yi),它在(zai)樂(le)隊中(zhong)(zhong)主要擔(dan)任低(di)音(yin)聲(sheng)(sheng)部,有時也作即興獨奏。傳統爵士(shi)樂(le)一(yi)般都采用(yong)原聲(sheng)(sheng)貝(bei)(bei)司(即低(di)音(yin)提琴)來(lai)體現它的原始風味。而在(zai)現代爵士(shi)樂(le)(特(te)別是融合爵士(shi))中(zhong)(zhong)經常運用(yong)電(dian)貝(bei)(bei)斯或(huo)電(dian)子合成器中(zhong)(zhong)的合成貝(bei)(bei)斯音(yin)。貝(bei)(bei)斯屬電(dian)聲(sheng)(sheng)樂(le)器,音(yin)量變(bian)化可以調節(jie)。中(zhong)(zhong)低(di)音(yin)區(qu)(qu)發音(yin)厚實響亮(liang),高音(yin)區(qu)(qu)則較明亮(liang)。