Tenor Leslie Tay’s performance in Hubbard Hall Opera’s production of Gilbert and Sullivan’s Trial by Jury was praised for being the “standout of the afternoon, with a clear and crisp voice and easy graceful movement on the crowded stage". Locally, Leslie has performed in musicals with Singapore Repertory Theatre and premiered roles written by playwright Stella Kon for Musical Theatre Limited. He has also sung for Dim Sum Dollies in three of their productions. His theatre training was with SRT Young Co. and Young & W!ld and he has appeared in masterclass with legendary soprano Marni Nixon.

He made his Carnegie Hall debut with New York Lyric Opera in 2009. Other performances include leading roles in operas such as La Cenerentola, L’elisir d’amore, Semiramide and Don Giovanni. He has also distinguished himself in the character tenor roles of operas such as La Traviata, Madama Butterfly and The Magic Flute. He has appeared with New York companies such as Dicapo Opera, Bronx Opera, dell’Arte Opera Ensemble, and the Singapore Lyric Opera. In May 2015, he sang with Bellepoque at the Esplanade Recital Studio in their pastiche operetta George and the Music Box, featuring the music of Offenbach. Other recent performances include Frederic in The Pirates of Penzance with Braddell Heights Symphony Orchestra in June, Prologue in New Opera Singapore's performance of Britten's opera, The Turn of the Screw at Victoria Theatre in July and he was the featured tenor soloist in Singapore Sounds Orchestra's Inaugural Gala concert at the Yong Siew Toh Conservatory in Sept 2015.

He has also sung with Boston Lyric Opera Chorus and Tanglewood Festival Chorus (Boston Symphony Orchestra) and was a Young Artist in Lorin Maazel’s 2011 Castleton Festival. He earned graduate degrees from Manhattan School of Music and Boston Conservatory. His teachers include Richard Conrad in Boston, who has recorded with Joan Sutherland and Richard Bonynge, Richard Byrne in New York, and Dr Thomas Manhart in Singapore.