Ceilidh bands usually charge about 300 GBP per musician, so a trio would cost roughly 900 GBP and a 4-piece ceilidh band would cost approximately 1,200 GBP. As with all musicians, price depends on several factors, not least how far they will need to travel to reach your venue. Bands will generally quote an all-in price (which includes all expenses) or quote their performance fee with expenses clearly detailed.