Tunda means one who does not have full arm i.e. one whose arm is amputated. Dhadis in olden days used to sing the Prasang (story) of Raja Asraaj. Guru Sahib has instructed us to sing Siri Asa kee Vaar on this tune. The story of Raja Asraaj has been written by Professor Sahib Singh. The translation is as follows:
Asraaj was a prince whose father's name was Sarang. When Asraaj's mother died, Sarang got married to a much younger woman. At that time, Prince Asraaj too had entered youth and was very handsome. The new stepmother was evil and she got infatuated towards her stepson - Asraaj. She tried to seduce Asraaj but he was a person of high moral character and denied her advances. She was very upset and scorned. She lied to the king and got Asraaj implicated in a false case of trying to rape her. The king whose intelligence was blinded by Kaam, believed his wife and in anger ordered death sentence for his son. The Vazir of the king was a wise man. He did not get the prince killed but had his hand amputated as a proof of his death. Asraaj was left in a deserted well outside of the kingdom.
As Asraaj was lying in the well, injured, a tribe of nomads passed by and took Asraaj along with them. They sold Asraaj to a washerman. Asraaj started serving the washerman to the best of his ability. Incidently, the king of that kingdom passed away without leaving any heirs. The Vazirs decided that the first person who knocks at the city doors will be crowned the king. The fortune of Asraaj awakened. The bull of the washerman got lost and Asraaj who was looking for it, came and knocked the doors of the city early morning. This way he became the king of that kingdom.
Since he was a prince, he was already capable of doing good administration. Soon the kingdom became very prosperous. In a short while, famine befell on the kingdom of Asraaj's father Sarang. The Vazir of his father came to Asraaj to buy some food. They both recognized each other. Asraaj sent a lot of food for his countrymen, free of charge. The Vazir told the king about his son and advised him to give his kingdom to Asraaj. The king too realized his mistake and this way father and son met again. Sarang gave his kingdom to his son Asraaj and retired.
The Dhaadis of that time, sang this whole story in poetry in the court of king Asraaj and got rewarded. This way, the tradition of singing this Vaar started. Satguru jee gave the Hukam to sing Siri Asa kee Vaar on the tune of this Vaar.