Tiana Thomas-Ambersley (born 22 November 1995), known professionally as Tiana Major9, is a British singer. She is best known for her 2019 single "Collide" (featuring EarthGang), released on the Queen & Slim film soundtrack. Earlier that year, she signed with Motown.
Tiana Major9 was born and raised in the London Borough of Newham, England and grew up in a Jamaican household, listening and singing gospel in church from the age of five. They studied music at the City and Islington College before pursuing it as a career. They gained local recognition in 2014 as a finalist in MOBO's UnSung competition.
Between 2017 and 2018, Major9 released singles "Merry Go", "Levee (Let It Break)", and "Mr. Mysterious". On 25 January 2019, Major9 released their debut EP, Rehearsal @ Nine. They also appeared on Stormzy's album on the song "Rainfall" and the Queen & Slim soundtrack on the song "Collide", the latter being nominated for a Grammy Award. On 7 August 2020, Major9 released their second EP, At Sixes and Sevens, after signing with Motown.
The name Major9 refers to the major 9th chord. Her sound has been compared to the likes of Amy Winehouse, Jazmine Sullivan, Marsha Ambrosius and Lauryn Hill, blending elements of soul, R&B, jazz, and reggae.
Thomas-Ambersley uses she/they pronouns.