Gillian Horn was born in Glasgow and took up the bassoon aged 10. She studied for both her Bachelor and Masters' degrees at the Royal Conservatoire of Scotland, taking lessons from Peter Whelan (SCO), Alison Green (SCO) and David Hubbard (RSNO). A highly active ensemble player, she was successful in winning places on the coveted mentoring schemes with RSNO and SCO, the latter of which culminated in three highly acclaimed performances of Mozart's Gran Partita for Winds and a BBC Radio 3 broadcast. In 2018, Gillian was invited to join the SCO for their annual Highland summer tour.

Gillian has a particular love of opera and has been Principal Bassoon of Raucous Rossini opera company since 2015, touring the UK and Umbria (Italy) each summer. In 2018 she appeared as a soloist with RR performing Mozart's Sinfonia Concertante for Winds. She has also played as principal bassoon with New Generation Festival (Florence), Clyde Opera Group, Edinburgh Grand Opera, Magnetic Opera and the Scottish Concert Orchestra.

Chamber music has always been Gillian's passion. Aside from Sirocco Winds, Gillian is also a founding member of the Genovia Quartet - an all-female bassoon quartet formed at the Royal Conservatoire of Scotland in 2015. Within the Conservatoire they were awarded Highly Commended in the Governor's Prize for Chamber Music, and subsequently awarded the Mary D. Adams Prize - a school-wide award for achievement in chamber music. Represented by Live Music Now Scotland and Classical Musicians Scotland, they have performed all over the country including Westbourne Music, Leeds College of Music, Usher Hall and Glasgow Cathedral Festival. In summer 2018 the quartet were invited to Granada to perform at the prestigious International Double Reed Society Conference to high acclaim.

Gillian is a grateful recipient of scholarships from Dewar Arts Awards, Musicians Benevolent Trust, Wolfson Trust, Craxton Memorial Trust and the EMI Music Sound Foundation.

Gillian has been a proud member of Sirocco Winds since May 2016.