Thiruppavai and Divya Prabhandham at TTD (Venkateshwara Swami temple), Tirumala, Thirupathi.
Thiruppavai seems to be the only prayer to lord Thiru Venkateswara in Tamil Language. Remaining are in Sanskrit.
Also, in the following videos, I will be covering the most popular Poems/Slokas of Sri Vedanta Desikan (Swami Desika, Swami Vedanta Desika, Thoopul Nigamaantha Desikan) (1268–1369) who is a Sri Vaishnava guru/philosopher and one of the most brilliant stalwarts of Sri Vaishnavism in the post-Ramanuja period. He was a poet, devotee, philosopher, logician and master-teacher (desikan).