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In page Irish traditional music session:

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Sessions are usually held in public houses or taverns. A pub owner might have one or two musicians paid to come regularly in order for the session to have a base.[1] These musicians can perform during any gaps during the day or evening when no other performers are there and wish to play. Sunday afternoons and weekday nights (especially Tuesday and Wednesday) are common times for sessions to be scheduled, on the theory that these are the least likely times for dances and concerts to be held, and therefore the times that professional musicians will be most able to show up.[citation needed]