Oi! Tales of Bardic Fury is a Manga/Manhwa/Manhua in english language, SUGGESTIVE series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

Once upon a time in ancient Ireland, a bard-in-training named Bryan gets sent to a town that never heard music before. Oi is a fantasy comic about rockstar bards, idols, witches and druids.