Sydney was born in New York, and began playing the horn at the age of eight. She studied at The Juilliard School and The Curtis Institute, where she received a Bachelors and a Masters degree, learning with Bill Purvis and Jennifer Montone.
After finishing university, Sydney decided to relocate to Australia, and began freelancing in Melbourne. She held the position of tutti horn with Orchestra Victoria for four years. She also performs regularly with the Melbourne Symphony Orchestra, Sydney Symphony Orchestra, Adelaide Symphony Orchestra, Hong Kong Philharmonic Orchestra, Macau Philharmonic, and the Malaysian Philharmonic Orchestra. As a soloist, Sydney has played concerti with the Essendon Symphony Orchestra and the Melbourne Sinfonia.