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.
The oratorio Llawenhewch yn yr Iôr and the dramatic cantata The Coming of Arthur were both musical works that had their premieres in 1906 and 1907, respectively.