In some places northern Chuvash know a very beautiful and poetic myth about rush and birth of a song. According to them people have learnt to sing from rush. Sitting by rushy undergrowth for a long time they listened to the rustling of rush.
Vash-vash-vash
Chi-chi-chi
People began to imitate the rustling of rush, this is the origin of a song. (Vompukassi).