Tiana Major9 has been played on NTS shows including System Olympia, with Collide first played on 12 September 2020.

Born and raised in a Jamaican household in the London Borough of Newham, Tiana Thomas absorbed numerous styles of music, sang in church, and was particularly drawn to jazz and R&B. Naming themself Tiana Major9, after one of their favourite chords, they gained some notice in 2014 as a finalist in MOBO's UnSung competition. Her first commercial recordings arrived in 2017 and 2018 with the singles "Merry Go", "Levee (Let It Break)" and "Mr. Mysterious" baring inspirations such as Lauryn Hill, Marsha Ambrosius, and Jazmine Sullivan. A busy 2019 began with the Rehearsal @ Nine EP, which contained the latter two singles, and continued a few months later with the finalisation of a Motown deal. "Collide", a collaboration with Dreamville signees EarthGang, appeared that November on the Motown-issued soundtrack for Queen & Slim. The track entered the Adult R&B Songs chart the same month and remained for 26 weeks. Thomas' profile back home was raised during this period with a featured appearance on Stormzy's number one U.K. album Heavy Is the Head. A second EP, At Sixes and Sevens, arrived in August 2020, after Thomas signed to Motown.

In March 2022, Thomas released their third EP Fool Me Once, which featured a guest appearance from Smino.