With Hozier and Kaiser Chiefs already joining Dave Grohl and the guys in Meath this May, you'd have thought the bill was strong enough to be more or less complete.
This Monday morning brings further big additions, however, and they're homegrown.
Downpatrick's finest Ash and Cavan teen beat combo The Strypes are now confirmed to play this year's Slane, which takes place May 30.
Tickets are priced €79.50 and are on sale now.