Uilleann pipes
Generally there can be an unlimited number of fiddles, flutes, accordions and tin whistles. The bodhrán is common in Irish sessions, but many sessions prefer that only one person play the bodhrán at a time. Uilleann pipes are common in Irish sessions, but the more commonly known Great Highland Bagpipes are never used in a session, because they drown out other instruments. Mandolins, banjos, citterns and bouzoukis are welcome in moderation. Guitars and dulcimers are frequently allowed in sessions without strict "'traditional' instruments only" rules.