Answer:
The method of worship in the Bhakti time was to travel across the globe singing songs. The songs were sung by worshippers to honor their Gods. The songs sung by these devotees were sung in Tamil.
Bhakti is a movement that originated in India. Bhakti movement was founded by the people of South India by the devotees of Lord Shiva and also by those who were devotees to Lord Vishnu. They were the devotees of Lord Shiva were referred to as Nayanars and those who were followers of Lord Vishnu were referred to as Alvaras.