Mohi began working as a television producer in the mid-1980s, focusing on Māori-related content.[2] In 1992, Mohi released her debut single "Kia Ū", a Māori language song describing the mistreatment of Māori in New Zealand.[5] Mohi released her debut album Oceania in 1999, and was a success, becoming double platinum certified in New Zealand.[2][3] The album, a collaboration with English producer Jaz Coleman, blended Māori language lyrics, melodies and taonga pūoro (traditional instruments) with a 1990s pop house sound.[5] The album's success made Mohi, alongside Moana and the Moahunters, famous for being one of the few musical acts who promoted a distinctively Māori form of popular music.[5]
In 1999, Mohi performed the New Zealand National Anthem at the opening game of the 1999 Rugby World Cup.[2] Mohi was asked to sing the anthem and she requested permission to sing it in both English and Māori but was told that she could only sing it in one language, with the unspoken expectation that it be performed in English. Mohi decided to sing the anthem in Māori instead, which received wide backlash in the New Zealand press at the time.[2] Mohi was bemused by the reaction, after being immersed in spaces in New Zealand that had celebrated Māori culture.[6] This proved to be a turning point, sparking a national conversation about cultural identity and the first language of New Zealand,[7] and is the reason why the anthem had begun to be sung bilingually since the early 2000s.[2]
In the early 2000s, Mohi co-founded the Raukatauri Music Therapy Centre with her husband George Bradfield.[2] They were inspired to create the centre because of their daughter (who suffers from cerebral palsy) and her experiences with music therapy in London.[2] In 2004 Mohi set up the television production company Raukatauri Productions, which has produced shows such as Mōteatea and Marae DIY, which won the best reality show award at the 2007 Qantas Television Awards.[1] In 2013, Mohi released Raukatauri – Te Puhi o Te Tangi, an album reimagining her songs in collaboration with the Auckland Chamber Orchestra.[8]
Mohi produced and curated the 2019 album Waiata / Anthems, a compilation album released for te Wiki o te Reo Māori (Māori Language Week), where popular New Zealand musicians re-recorded their songs in Māori.[2] The album debuted at number 1 on the Official New Zealand Music Chart.[9] Due to the success of the album, the project was revived in 2021, becoming Waiata Anthems Week, an annual celebration of music recorded in Te Reo Māori.[10]
As a member of APRA, Mohi mentors musicians to promote the development of Māori music.[2] In her capacity as Apra Amcos Māori development leader Mohi led the project of Lorde's te Reo Māori EP Te Ao Mārama. Mohi sings on "Hua Pirau / Fallen Fruit".[11]
In 2015, Mohi was awarded the Distinguished Alumni Award by the University of Waikato.[3] In 2016, Mohi received the Te Puni Kōkiri Te Reo Māori Champion Award at the Women in Film and Television New Zealand Awards. She was inducted into the New Zealand Hall of Fame for Women Entrepreneurs in 2020.[13]
^Raukatauri – Te Puhi o Te Tangi did not enter the Official New Zealand Music Chart, but peaked at number 16 on the Top 20 NZ artists' albums chart.[16]