Peter Ralchev laid the beginning of new style in Bulgarian folklore instrumental music and exerted great influence on its development. With marvelous mastery he performs Bulgarian folklore as well as classical pieces, French musettes, Serbian, Romanian and other instrumental pieces characteristic of accordion. He is included in the book "History of Accordion" published in France in 1991 by Francois Billard and Didier Roussin. Since 1986 he plays wth "Trakiisti", a quintet of Bulgarian folk music, playing original and traditional compositions.