Stephen Devassy's first major break came when he was aged 18, through Johny Sagarika, for whom he did the music orchestration of six songs on the album
Ishtamannu. He then went as an accompanying artist to play the keyboard for
Hariharan on his European tour. He has also accompanied the
violin maestro L. Subramanian at the Lakshminarayana Global Music Festival. At age 19, he started a music band called Seven, with singer
Franco Simon and guitarist Sangeeth Pavithran. An
Indian pop band, they released an album titled
YehZindagani Stephen, who started performing at a young age, has done the music arrangement for many films. Some of the films he scored were
Majaa,
Thambi,
Nammal,
Azhagiya Thamizh Magan, Hariharan's album,
Waqt Par Bolna and so on.
Hariharan Pillai Happy Aanu (2003) was his debut music directorial venture in
Malayalam. Lyrics were written by famous young lyricst
Rajeev Alunkal. The film "KQ" (2013) by Baiju Johnson, a story of two hard working friends also had a touch of Stephen's music. He also composed the music for
Neerali, the survival thriller film released in 2018 and three songs for the 2023 neo-noir action thriller
Pakalum Paathiravum. In 2024, he composed a song for the Malayalam legal drama
Gumasthan. He is one of the regular band members in
Rexband, a
Christian contemporary band singing gospel fusion, a musical outreach of the
Jesus Youth Movement. He performed with the band before
Pope John Paul II during
World Youth Day performance in 2002 at Canada. At the time, it was the only catholic band invited from India. Stephen has orchestrated an instrumental version of the popular
Rexband melodies called
Different Vibes. In association with Kosmic Music, Stephen has also set to tune to a background of Western music,
Sanskrit slokas, mantras and verses from the Upanishads, called
Sacred Chants of Kosmic Music, and albums of holy chants on Ganesha, Shiva and Vishnu. He has released his album
Romanza, which was a mix of
world music sprinkled with the flavor of piano. Indian
ragas have been treated with the rich use of contemporary piano.
Hariharan,
Ouseppachan and a Russian vocalist appeared as guest artists on the album. Stephen's solo stage shows have propelled him to the top league of onstage performers. Stephen did the role of an ideal judge in
Amrita TV show Superstar Junior (2016),
Top Singer (2018-2019) of
Flowers channel and Star Singer on
Asianet. ==Achievements==