Amongst his musical arrangements were "Down Among The Dead Men", based on an old English melody for a male chorus, "The Lord's Prayer", and a Welsh piece "I Toriad Y Wawr" (The Break Of Dawn).
During the early part of the war in the 1940s he was instrumental in providing Mai Jones, who was working for the BBC in Cardiff with a musical score, composed initially by a friend and fellow Lyrian singer Thomas Morgan.
In November 1943, at a gathering of a small group of music lovers, at his home in Llandaff, he was instrumental in forming The Lyrian Grand Opera Company.
One of his former students Mollie Hair remembers him as a quiet, patient and understated man, who never lost his temper and was completely dedicated to music.
Whilst the miners, policemen and shopkeepers who made up the chorus, had wonderful voices, he persuaded Mollie to work as a coach to bring visual grace to their operatic performances.
In January 1950 Idloes Owen invited an astute businessman Bill Smith a former secretary of the defunct Cardiff Grand Opera to be his partner to develop the potential of the new company.
They performed two Verdi operas Nabucco and I Lombardi alla prima crociata and Wagner's Lohengrin, to many curtain calls and rave reviews.