The Tamil film songs were strongly based on Carnatic music tradition. P.U.Chinnappa was followed by Chidambaram Jayaraman,Tiruchi Loganathan. Sivaji Ganesan, the recipient of Dada Saheb Palke award, could sing eloquently, but did not do so in movies giving way to the playback singers. P.B. Srinivas were introduced in Tamil. Other singers from Telugu field are S.Janaki, P.Susheela.
Music obviously has no language barriers.
The trials faced by Viswanathan Ramamurthy,G.Ramanathan,S.V.Venkatraman are not faced by the present day musicians. He changed the history of Tamil cine music by giving lighter, melodius songs appreciated by all. Chandrababu with his interest in western music also got them to make songs for him mostly based on westwern style. Shankar Ganesh have directed music in several films. V.Kumar was a music director who was brought into film music by K.Balachander from his drama days.