The oratorio Llawenhewch yn yr Iôr was first performed at the Caernarfon Festival in 1906 and a dramatic cantata The Coming of Arthur, was premiered at the Cardiff Triennial Festival the following year.
In 1906, the oratorio "Llawenhewch yn yr Iôr" had its debut performance at the Caernarfon Festival.  The following year, the dramatic cantata "The Coming of Arthur" premiered at the Cardiff Triennial Festival.