Whilst attending university, Rajah wrote, composed, and sang two songs in Telugu with the instrumental support of the music director K. V. Mahadevan for HMV.

After listening to these songs, Vasan, with the approval of his music directors Emani Sankara Sastry, and Kalki Krishnamurthy, booked Rajah for his upcoming film, Samsaram.

Rajah also sang in a few Sinhala films produced in Chennai and Sri Lanka with Jikki and K. Jamuna Rani.

Mahadevan was the first to openly drop him after recording the song "Kayile Inippathenna, Kaniyanal Kasappathenna", which was followed by a heated argument on the set of Manamulla Maru Tharam (1958).

It is noteworthy that G. Devarajan mentioned in his book that not only Rajah was an excellent melodious singer, but also of a straightforward character often misunderstood.

In the 1970s, he composed music for films Amma Enna Stree(Malayalam-1970), Veetu Mapillai (Tamil-1973) and Enakkoru Magan Pirappan (Tamil-1975).

In transit to perform at a concert in Kanyakumari district temple,[3] Rajah reportedly attempted to board a moving train, whereupon he tripped and fell onto the tracks.