 1602, his son Vitthalnath, also known as Gusainji, established the eight-fold system of singing the name and glory of Shrinathji (Kirtana) and entrusted this responsibility to eight poet-disciples of Vallabhacharya and his own, called the ashta-chhaap after the eight divine services to Shrinathji from morning until going to sleep.Foremost among them was Sur, the blind poet of Agra.These are Surdas, Krishna Das, Paramanand Das, Kumbhan Das, Chaturbhuj Das, Nand Das, Chhitswami, and Govind Swami.