Rebecca Gill began learning violin through the Suzuki method at the age of four before studying in her teenage years with Elizabeth Holowell at the Newcastle Conservatorium. In 2006 she began a Bachelor of Music degree at the Sydney Conservatorium, studying with Janet Davies and graduating with First Class Honours. An Australian Postgraduate Award supported her subsequent Master of Music Performance research degree.

Rebecca Gill was a member of the Australian Youth Orchestra from 2008 to 2012 and was principal second violin for four seasons. She was also the concertmaster of SBS Youth Orchestra (2007–2009) and continues to work with several community orchestras as a tutor. In addition, she has performed as a guest leader with ensembles including the Sydney Chamber Opera, Sydney Camerata and the Ku-ring-gai Philharmonic Orchestra and has performed with the Britten Pears Orchestra (UK).

From 2009 to 2012 Rebecca Gill was a member of the Sydney Symphony Orchestra’s Sinfonia training orchestra and in 2013 she participated in the Sydney Symphony Orchestra Fellowship program. She joined the second violin section of the Sydney Symphony Orchestra in 2016.