Transcriptions can be created for all kinds of music in order to help the performer to learn the piece. Transcriptions are common for music such as jazz (which usually consists of improvisation) and folk, which traditionally is taught from one generation to another by listening and imitating. In the early 20th century, some composers became interested in writing down the traditional folk songs of their countries. Béla Bartók and Zoltan Kodaly in Hungary as well as Cecil Sharpe and Ralph Vaughan Williams in England notably transcribed various folk songs they heard being sung in the villages of their respective countries.