Valentine began a career in 1981 working alongside composers such as Stephen Sondheim (Sweeney Todd, Into The Woods), Stephen Schwartz (Wicked, Pippin), John Kander (Cabaret, Chicago, Kiss Of The Spiderwoman), Lord Andrew Lloyd Webber (Love Never Dies, Cats, Aspects Of Love) and Maury Yeston (Nine, Titanic.)

He has conducted the following West End musicals (all of which won Olivier Awards for Best Musical or Best Musical Revival): 42nd STREET (Drury Lane), KISS ME KATE (Victoria Palace), MERRILY WE ROLL ALONG (Donmar), COMPANY (Donmar), CHICAGO (Adelphi), CITY OF ANGELS (Donmar).

He has most recently conducted MY FAIR LADY at The London Coliseum and is the UK Music Supervisor of it’s subsequent UK Tour.


Orchestras include: BBC Symphony Orchestra, BBC Concert Orchestra, Tulsa Symphony Orchestra, Orchestra de Chamber de Paris, Pasdeloup Orchestra, Welsh National Opera Orchestra, Queensland Symphony Orchestra, Royal Philharmonic Concert Orchestra, Rome Opera House Orchestra and National Symphony Orchestra.

He has conducted for many international artistes including: Barbara Cook, Eartha Kitt, Betty Buckley, Elaine Paige, Liza Minelli, Christopher Reeves, Dame Judi Dench, Sir Bryn Terfel, Catherine Zeta-Jones, Chita Rivera, Jerry Lewis, Sir Elton John, Marin Maisie, Sir Roger Moore, Sir Ian McKellen, Clarke Peters, Victoria Wood, Joel Grey and Wayne Sleep.

Gareth’s REQUIEM has been performed at Southwark Cathedral, in Warwick, Boulder, Colorado, Helsinki and Paris as well as recorded at Abbey Road Studios, London.

He was commissioned by The Old Vic to compose a new score for Aladdin starring Sir Ian McKellen as Twankey.

He composed the ballet Strictly Gershwin for English National Ballet which played the Royal Albert Hall and a sellout UK tour with seasons in Tulsa and Queensland, USA. It is to be revived in Europe in 2022.

He was recently described in The Stage as “one of the West End’s most sough- after musical directors.”

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