Andrew was born in Mountain Ash and was educated at the local comprehensive school. He attended the Welsh College of Music and Drama where he studied organ under Robert Joyce, the organist of Llandaff Cathedral. He also studied choral conducting with Hungarian-born Celia Vadja, a former pupil of the famous composer Kodaly. Andrew then attended Phillipa Fawcett College, London and gained a teaching diploma. On leaving college he entered the civil service, working in the Department of Employment in Brixton, South London. Whilst there he was, for a period of time, organist and choirmaster at the Holy Trinity Church in Upper Tooting. In 1982 his job transferred to Cardiff and since returning to Mountain Ash he has involved himself in many musical activities. He joined the Mountain Ash and District Choral Society, where after a period of serving as Assistant Conductor and Accompanist he was appointed Conductor in 1991.

In 1993 he accepted the post of Musical Director of the Cwmbach Male Choir and led them on a successful Canadian Tour, but relinquished his position in May 1997 to take up the baton in Treorchy.

As the fourth conductor of the reformed Treorchy Male Choir, he led them on a series of celebrity concerts including on board the magnificent Enchantment of the Seas luxury cruise liner. In November 1999 he took the Choir on its month-long tour of Australia, followed in 2000 by a tour of Canada and the USA. Under his baton the Choir also made a return to Australia in 2004, taking the Sydney Opera House by storm.

Andrew was awarded Honorary Membership of the Treorchy Male Choir in 2008.