2010: The X Factor

Byrne entered reality television show The X Factor in 2010. Her employer, Tesco Ireland, started a campaign to persuade all staff to support her.^[13] Byrne advanced to the live shows and was mentored by Louis Walsh in his Over 28s category. On the first live show, Byrne gained the most public votes by singing "It's a Man's Man's Man's World".^[14] Byrne's song "I (Who Have Nothing)" that was successful in Dublin was a relief to Walsh as Simon Cowell was annoyed with him for wanting to stage the auditions there. Byrne was in the 'Final Showdown' twice. In the quarter-final, she was in the Bottom Three with fellow contestants Wagner, and Katie Waissel. As Waissel received the fewest votes she was eliminated first and competed against Wagner in the final showdown. Byrne advanced to the semi-final after Walsh, Dannii Minogue and Cheryl Cole voted to send Byrne through to the semi-final. Although Simon Cowell was not required to vote as there were already three of the four judges voted to send Byrne through to the semi-final, he confirmed that he would’ve also voted to send Byrne through to the semi-final. However, in the semi-final, Byrne was in the bottom two with Cher Lloyd and was eliminated with only her mentor, Walsh voting to send Byrne through to the final, who was the twelfth contestant eliminated. After the series finished, voting statistics revealed that Byrne received more votes than Lloyd. This meant that if there was not a Final Showdown, or if Minogue or Cowell voted to send Byrne through to the final or if the result to deadlock, Byrne would've advanced to the final and Lloyd would've been eliminated.

2011: Mine & Yours

Following her career on The X Factor, Byrne signed a record deal with Sony Music Ireland and began work on her debut album.^[1] The album, Mine & Yours, was released in the UK on 28 March 2011, and 25 March in Ireland.^[15] Byrne released her debut single, a cover of Martina McBride's "I Just Call You Mine", due to phenomenal demand when the track was debuted from her album Mine & Yours on Irish radio. The fan reaction was so positive that Sony Music Ireland were 'inundated' with requests to make the song available to the public and 'eager fans' prior to the album's release.^[16] After little to no promotion, the song peaked at number 12 on the Irish Singles Chart.^[17] Byrne revealed her album would be sold on QVC like Susan Boyle did to help sell a few more copies.^[18] In an interview with Digital Spy Byrne stated;

Recording this album was a dream come true. I'm so grateful for all of the support I received both during and after the show. Nothing I'm experiencing now would have been possible without the wonderful people who picked up their phone each weekend and voted for me! I hope you enjoy listening to the album as much as I enjoyed making it.

— Mary Bryne in an interview with Digital Spy^[19]

The album was produced by hit-maker, Nigel Wright^[20] and contains tracks which Mary performed on The X Factor. However, the songs on the album are not her performances from the show.^[20] Byrne was on the 2011 The X Factor Live Tour, and Sony Music began planning Byrne's first solo concert tour before she decided to move onto Universal music.^[21] Mine & Yours debuted at number-one on the Irish Album Charts on 31 March 2011.^[22]

2011: ...with Love

On 13 September 2011, it was announced that Mary Byrne had asked to end her record deal with Sony, and asked to switch to Universal.^[23] It was later announced that she had started working on a second album, produced by Phil Coulter, to be released in Ireland by Universal Music Ireland, and in the UK by Decca UK.^[24][25] On 2 November, Mary Byrne stated on her Facebook page that her latest album, which is called ...with Love, would be released in Ireland on 25 November. Her management team later announced that the album would be released the following year in March for the UK. She appeared on The Late Late Show the day of Ireland release, and talked to Ryan Tubridy after performing a song on the album called "Thank God That This Was My Life", written for her by Phil Coulter.

2012: "An Evening With Mary Byrne & Phil Coulter"

Mary began a concert featuring her latest songs from the album with Phil Coulter at the INEC, Killarney and in the Royal Theatre, Castlebar in April 2012. Initially, one night was planned for the acts to perform in the Olympia Theatre, Dublin on 8 May 2012. However, the public demand for tickets was so overwhelming, 5 extra nights were added, eventually resulting in a total of a 6 night residency leading up to 13 May 2012.^[26][27] Both Mary Byrne and Phil Coulter performed individually throughout the shows, but they also sang numerous duets. The shows were met with a number of standing ovations from the audience and an encore on each of the six nights. Despite the fact the concert was initially intended to showcase songs from "...with Love", Mary sang several songs from her début album "Mine and Yours" and other songs which did not appear on either album.

Autobiography

In November 2011, Byrne released an autobiography co-written by Eddie Rowley, entitled This Is My Life, named after the Shirley Bassey hit of the same name. The book was released by O'Brien Press in Ireland and was on the bestseller list for four weeks. During the same time, the book was also released in the United Kingdom. This Is My Life was met by good reviews, not only catering to fans of The X Factor but also regaling stories of a Dublin youth and an exhilarating list of experiences, and thus appealing to a wider audience.^[28] Amongst the stories which Byrne narrates throughout the book, she writes of a year which she spent on kibbutz Geva in Israel, travelling Europe whilst working for a Dublin factory, moving homes and even winning a car. The book contains several accounts of failed relationships, and Byrne admits to having a two-year relationship with a colleague.^[29] A darker side of the book looks at the deaths of Byrne's parents, and in particular, the heartache which Byrne experienced after the death of her mother, who suffered from suspected Alzheimer's disease. A first hand account is given of life on The X Factor both on stage and backstage through the eyes of a contestant, describing the difficulties which Mary experienced, her true opinions of other contestants and her stance on the judges.^[30] The book achieves in combining fifty years of a "salt of the earth" existence with a new-found life of fame, with both sides experienced by the same person.

2013: Magic of the Musicals

In March 2014 Mary recorded "Magic of the Musicals". This reflects her love of the timeless classics. Magic Of the Musicals contains eleven tracks including 'On The Street Where You Live', Cheek To Cheek', and 'Hello Young Lovers'. The album also includes Mary's first self-penned number, 'Midnight Dreamer'.^[31]

Studio albums

Singles