Something common between the Thilagams

There are two films of MGR and Sivaji that never released the records. One is Sridar's Sithoor Rani Bathmini with Sivaji Ganesan and Padmini acting. The super songs were by GR but they never came out in record. The other is Kalai Arasi with MGR acting, and KVM providing the music. This is the first Tamil film to show outer space, a story loosely based on UFOs. I thought one of the best sci-fi movies of all time. But a flop. Still had good songs. This movie was directed by Ramanna if my records are right.