Devarajan was born on 27 September 1927 at
Paravur, near Kollam in then
Travancore to
mridangam player and classical singer Paravur N. Kochu Govindan Asan and Kochukunju as their eldest son. His grandfather, Narayanan Asan, was a
Kathakali artist. His dad, though he was a mridangam vidwan and a disciple of
Dakshinamurthy Pillai, primarily taught vocal to his students, and thus Devarajan learned Carnatic vocal for around 12–13 years adeptly from his own father through that. He did his intermediate college at
University College in Thiruvananthapuram from 1946 to 1948 and passed with First Class. He graduated with BA in Economics from
Mahatma Gandhi College, Thiruvananthapuram. Devarajan, under the name of Paravur Devarajan or Paravur G. Devaraj, started his illustrious career in music as a classical singer and performed his first
classical concert at the age of 17 and started to perform more concerts on
AIR Tiruchi and Trivandrum. He performed a number of classical concerts from 1945 to 1962 with multiple accompanists, his usual ones being Chalakudy Narayanaswamy and
Mavelikara Krishnankutty Nair. At the end of his classical concerts, he used to set tunes to the poems of
Ulloor Parameswaran Iyer,
Kumaranasan,
Changampuzha,
G. Kumarapilla,
O. N. V. Kurup,
P. Bhaskaran, amongst many others. He was soon attracted to the
Communist movement and decided to dedicate his creative energy to popular music. He joined the once-famous drama troupe of Kerala, the
Kerala People's Arts Club (KPAC). The work that brought him to the limelight was the drama song "Ponnarivaal ambiliyil kanneriyunnoole", written by his friend
O. N. V. Kurup and composed and sung by himself. KPAC and its members had a distinctive leaning towards the communist
ideology, and their dramas played a role in spreading the ideology among the Keralite masses. Through his compositions, Devarajan would cast an indelible imprint in the Malayali theatre arena, especially after the famous KPAC drama
Ningalenne Communistaakki, written by
Thoppil Bhasi in 1952. ==Film career==