Maynard's debut single, "Can't Say No", was released in the United Kingdom on 15 April 2012 – debuting at number two on the UK Singles Chart for the week ending 28 April with 74,792 copies sold. The track also saw chart success in Ireland, where it peaked at number thirteen. On 1 May, Maynard released the album track "Drowning" as a free download for any fans who pre-ordered the upcoming studio album, Contrast. On 5 May, he performed "Can't Say No" at the 7th annual edition of the TRL Awards in Italy. On 9 June 2012, Maynard performed "Can't Say No" at the Capital Summertime Ball in front of an 80,000 strong crowd.

Maynard released his second single, "Vegas Girl", on 21 July 2012 in the UK – it debuted and peaked at number 4 on the UK Singles Chart. On 30 July, he released Contrast, which debuted at number 1 on the UK Album Chart on 11 August 2012. The album sold only 17,000 copies in its debut week. He released the third single from the album "Turn Around", featuring Ne-Yo. It peaked at number 8 on the UK singles chart.

It was revealed in June 2013 that Maynard would release a book offering fans an insight into his rise to fame, entitled Take Off; it was released in October 2013. Maynard is currently preparing for the release of his second studio album. He has promised a new sound for the album and has confirmed that he has worked with Labrinth and Travie McCoy on the album.

On 23 August, Maynard confirmed that his new single would be called "R U Crazy", which was produced by Labrinth. The song premiered on radio on 25 August, as well as the music video appearing on 27 August.

In March 2014, Maynard took part in recording England's 2014 World Cup song. He collaborated with the likes of fellow pop stars Melanie C, Eliza Doolittle, Emma Bunton, Katy B, Kimberley Walsh and Pixie Lott, on "Greatest Day", a track originally performed by British band, Take That. The track was produced by Gary Barlow and recorded at Sarm Studios in London. The track also featured past footballers such as Gary Lineker, Michael Owen, Geoff Hurst, David Seaman, Peter Shilton, Glenn Hoddle and Dion Dublin on backing vocals.

On 1 March 2015 Conor released his new single "Talking About", the second single from the upcoming album. The single debuted at number 44 on the UK Singles Chart, becoming not only Maynard's first single to miss the top-ten, but also his first to miss the top-forty altogether. Within a month Conor released his third single called "Royalty". The single is extracted from his second upcoming album, which is predicted to be released at the beginning of 2016.

On 22 January 2016, the single "I'm Famous" by Marcus Butler was released featuring Maynard. It peaked at number 85 on the UK Singles Chart top 100, failing to reach the top 40. The single spent only one week on the chart. Maynard was also featured alongside Butler in the music video for the same song.

Conor performed at the Hertfordshire Summer Ball on 13 May 2016, along with other acts such as Becky Hill.

In July 2016, due to the success of his covers on YouTube, Conor announced he would be releasing an album of covers with one original track. A few of the covers included "Pillowtalk", "One Dance", "Hello" and "Stitches". The original was called "This Is My Version" and was written about a relationship he had previously been in. The album was released on 5 August 2016.

Maynard featured on a dance track called "Dancing in the Headlights" by DJ Antoine. Maynard also featured on a track called "Catch Me Here" by Drumsound and Bassline Smith which Conor had already written for 2 years. On 23 December 2016 he released the single "Are You Sure?" with Kris Kross Amsterdam featuring vocals from Ty Dolla Sign.

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