[4][5] Whilst at the RNCM Christos took lead tenor roles, such as Tamino in Mozart's The Magic Flute and Count Almaviva in the college's production of Rossini's The Barber of Seville performed at the Aix-en-Provence music festival in Southern France.

[9] This included footage of Christos' trip to the US on 6 September 2005, to perform with Erich Kunzel and his Cincinnati Pops Orchestra at a special "9/11" commemorative concert.

Christos also accompanied Davis in June 2007 at James Bond theme concerts with the Royal Liverpool Philharmonic,[13] and the next month at Leeds Castle in Kent.

In the summer of that year Christos headlined the Northern Proms in Durham.,[14] the autumn saw him perform at the Royal Albert Hall Football Reaching out for Africa charity concert organised by Patti Boulaye,[15] and in the winter he sang at the Professional Footballers' Association Centenary Match at the City of Manchester Stadium and the following gala Centenary dinner at Manchester's G-Mex centre[16] with Natasha Marsh.

He also performed with Alfie Boe and Garðar Thór Cortes as the new Three Tenors at the launch of the new Cunard Line ship the MS Queen Victoria at Southampton in the presence of Charles, Prince of Wales and Camilla, Duchess of Cornwall.

Duetto,[20] a new collaboration between Christos and soprano Jenny Williams was launched and was featured on a live BBC Radio Lancashire broadcast (3 July).

[22] The new decade began as the previous year with Christos singing this time at the memorial service of Maggie Jones, who played Blanche Hunt in the long running British TV series Coronation Street.

2011 appearances included a performance at the Inspiration for Women Awards at Royce Hall, UCLA, Los Angeles US hosted by Alison Sweeney.

[25] During 2012 Christos duetted with Jenny Williams at the Inspiration for Women Awards Cadogan Hall, London, Beverley Knight, Matt Cardle and Blake also appeared at the event.

[31] On July 4, 2015 Christos performed at the Anglican Liverpool Cathedral to celebrate the Cunard Line 175th anniversary of the first ship to set out on a pioneering voyage to North America.

[32] in October 2015 a Star Ball at the Hilton hotel Deansgate with guests including Jorgie Porter Nicole Barber-Lane Tricia Penrose and Ray Quinn saw Christos appear as a surprise singing waiter.

Christos has performed at a number of high-profile sporting events, including appearances at the Powergen Rugby Cup Final, the 2009 England vs Scotland 6 Nations Championship Rugby Union game at Twickenham along with Jonathan Ansell, the Heineken Cup Final at the Millennium Stadium in Cardiff and was credited as the first man to sing at the new Wembley Stadium.

[48] During 2010 Christos campaigned for the charity Leukaemia and Lymphoma Research by singing at numerous department stores, shopping centres, theme parks and train stations nationwide.