Koay Loong Chuen (better known as Jellal Koay, b. 2001) is a Malaysian composer & pianist. He started learning music through piano lessons since 2012 under the tutelage of Ms. Kwan Yin Hui. He served as the accompanist for the choir of SMK Seri Kembangan, during which the choir had won awards at national and international choir competitions. As a solo pianist, he was a finalist for the Southeast Asia International Piano Competition 2020 in young artist category.

Jellal began taking composition as his second study with the Malaysian composer Dr. Wong Chee Wei since 2019. As a student composer, he won several awards such as the 1st Prize for Solo Harmonica & Orchestra category in the Hong Kong International Composition Competition for Chromatic Harmonica 2021, 2nd Prize for Brass Trio category at The Diversity Initiative Call for Scores, and selected as one of the winning composers in the Malaysian Patriotic Music Composition Competition 2019 (Choir Category). He had also participated in the Virtual Manila Composers’ Lab 2020, Malaysian Young Composers’ Workshop 2021 and The Rondo Production’s Musical Exchange Programme 2021 (Composition).

Jellal is currently a Year 1 BMus (Composition) student at the Yong Siew Toh Conservatory of Music under the tutelage of Assoc. Prof. Peter Ivan Edwards.