The Karwa chauth song is sung when the women get together to perform pooja add sit in a circle to listen to Karwa chauth Katha and and sing the following song while rotating the thalis containing Baya.
“Veero Kudiye Karwada,
Sarv Suhagan Karwada,
Aye Katti Naa Teri Naa,
Kumbh Chrakhra Feri Naa,
Gwand Pair payeen Naa,
Sui Cha Dhaga Payi Naa,
Ruthda maniyen Naa,
Suthra Jagayeen Naa,
Bahaein Pyari Veera
Chan Chadde te Pani Peena,
Lay Veero Kuriye Karwara,
Lay Sarv Suhagan Karwara.”
Reference : http://www.indif.com/nri/bhajan/karwa_chauth/karwachauth_song1.asp