[2] Frankee Connolly was a part of Mini Viva until the duo's split in 2010, whereas Nadine Samuels and Annie Ashcroft were both members of the girl group Duchess until 2012.

M.O's initial aim was to bring old school 1990s music back, naming TLC, J.Lo, Aaliyah, and All Saints as an inspiration amongst others.

[9] They followed up their debut on YouTube with their first promotional single "Wait Your Turn", which was followed by other releases in 2013, including "Ain't Got Time" and "Hot".

[18][19] The same year, they signed a record deal with Polydor and released the promotional single "Love the Most", a collaboration with the HeavyTrackerz.

After a quiet 18 months, including the departure of Connolly, the group made a comeback with their new single "Bad Vibe", featuring Lotto Boyzz and Mr Eazi.

In October 2021, M.O released their first single since the COVID-19 pandemic, "U No" with producer collective Jodapac and British rapper French the Kid.