[3] That same year, aged twelve, he performed Haydn's Violin Concerto in C Major with the Sinfonia Toronto Orchestra at the Glenn Gould Studio, which was recorded and broadcast nationally by CBC Radio.
His summer studies included attending the Morningside Music Bridge and the Young Artist Programme at the National Arts Centre.
During the 2015–2016 season, Chooi was a member of the ensemble Time for Three, which performed with the Hong Kong Philharmonic and in locations including Barbados, Grand Teton, and La Jolla SummerFest.
Chooi's solos as concertmaster of the Metropolitan Opera Orchestra can be heard through the Metropolitan Opera Live in HD broadcasts in productions of Verdi’s La traviata, Janacek’s Jenůfa, and the Grammy-nominated recording of Richard Strauss’ Der Rosenkavalier released on the Decca Label.
He performs on a 1713 Stradivarius provided by Canimex, Inc., a 1749 G. B. Guadagnini on extended loan through the Stradivari Society of Chicago, and a 2016 Joseph Curtin.