 They use only left index and ring finger traditionally, and the scale is basically pentatonic (do re mi sol la).A technique unique to the Tsugaru-shamisen style in recent years is the tremolo played with the back of the bachi without hitting the skin.Group A presents songs that are only rarely heard today, though they were once the mainstay of the repertoire of itinerant, often blind, musician-beggars known as bosama.