Hi Dolgellau,
This is a sideshoot to my ancestry research.
My grandfather, the Victorian composer John Henry Roberts (the bard Pencerdd Gwynedd) was the clerk/secretary at Bryneglwys quarry near Abergynolwyn from 1866 until 1871. He formed a choir which competed at the Harlech Festival, and after some success he was persuaded to enter the Royal Academy of Music in London (funded by a committee of local businessmen and ohers, from which he graduated in 1874 and subsequently gained a B.Mus from Cambridge, composed more than 400 hymn tunes (many in use today) and after becoming organist at Turf Square church, Caernarfon, moved to Liverpool to a similar post. He left the diary (or a fragment of it (1870/71) and I have traced many of the names in it - others are proving difficult.