In the Oricon singles chart of April 1996, he monopolized all the top 5 positions as the songwriter and producer, a world record.

In 1995, he monopolized all top 3 positions of the copyright distribution rankings for the JASRAC Award, a record in Japan's music history.

[1] Total sales of the singles he has written exceed 42 million copies, making him the fourth best-selling lyricist in Japan.

He was also an early pioneer of dance music in Japan, and came to stardom in the 1990s as producer with a long string of hits with artists such as TRF (TK Rave Factory), Tomomi Kahala, Namie Amuro, Ami Suzuki, hitomi, Ryoko Shinohara and H Jungle with t. In 1994, he composed the musical score to the Japanese anime film Street Fighter II: The Animated Movie, based on the Capcom video game.

Ryōko Shinohara recorded the theme song of the anime film, "Itoshisa to Setsunasa to Kokoro Zuyosa to", with Tetsuya Komuro.

In 1997, he started his overseas career with the remix of the theme music for the soundtrack to the 1997 American film Speed 2: Cruise Control, which Japanese MMA fighter Kazushi Sakuraba and English pro wrestler Johnny Smith later adopted as their entrance music.

Komuro also released albums as a solo singer or musician and was involved in the bands Globe, Kiss Destination and Gaball.

On November 4, 2008, Komuro was arrested and charged with fraud, for taking ¥500,000,000 in exchange for a promise to sell to a Hyōgo-based investor the copyright to his songs, which he had already sold to somebody else (which was Avex Group Holdings according to reports).

[13] At the Avex Group Holdings' concert tour a-nation 2009, Komuro made a surprise appearance on August 22, 2009.

He played a medley of his hit songs at the piano and later reunited on stage with his fellow members of the J-pop group globe, Marc Panther and his wife Keiko Yamada.

[14] In January 2018, Komuro announced his retirement from the music industry, following revelations of an affair he had with a nurse who had been taking care of his wife Keiko after her brain surgery.