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As An Artist

Cassia O'Reilly is a 22 year old singer and songwriter with dual Irish/American nationality. She began her professional career singing backing vocals for Nao in 2014 before taking over as Mura Masa's lead singer and playing 100 shows with him between 2015 - 2017 as Bonzai.

In 2018 she changed her artist name from Bonzai to Cosha, launching her own sound and releasing her records on Columbia. Her debut mixtape is called R.I.P Bonzai and features production from Rostam (Frank Ocean, Solange, Vampire Weekend), Mura Masa, Johan Hugo (M.I.A, Mumford & Sons) and Jeff Gitty (J Cole, A$AP Ferg, The Internet). In Jun 2018 she also appeared as the lead vocalist on Chic's first new release in 25 years 'Til The World Falls', also featuring Anderson .Paak, Vic Mensa and Mura Masa.

As A Songwriter

Cosha has credits on Mura Masa Records going back to 2014, but it was with What If I Go that she had her greatest success. What If I Go was an A-List Radio 1 hit, soundtrack to Pretty Little Things' TV commercial and stands at 100m streams on DSPs. It remains one of Radio 1's best testing songs.

Cosha also wrote and features on the Mura Masa album favourite Nuggets and is pitching songs for major US pop records in 2017.