Forming in late 2010, Castlecomer released their debut EP "Danny's Den" on the 30th of March 2012 at one of Sydney's premier live music venues, The Gaelic Theatre in Surry Hills. Laying their claim as the last live act ever to grace the stage at the venue, they released their "Danny's Den" EP to a sell-out crowd of 600, and have continued to advance in leaps and bounds, thrilling audiences with their live performances in Sydney and down the east coast of Australia.