Grand Union Orchestra London Grand Union Orchestra is a multicultural world jazz ensemble based in London. It has been performing, touring and recording large-scale shows for over 30 years and is well known for its educational work. Grand Union specialises in large-scale musical performances that reflect the backgrounds of its performers and often invites participation from amateur musicians and community groups. These shows can have dozens of local musicians, groups, choirs and folkloric ensembles alongside the core 15-18 piece group. Led by its co-founder, artistic director and composer Tony Haynes, Grand Union works to highlight the contributions that immigrant musicians and communities, particularly in the East End, make to music in London and to British culture in general.