Band will perform at O2 Academy on August 15
The Las Vegas group will headline Bellahouston Park on August 19
The performances make up part of a short film about Cash's new posthumous release
Lily Allen, Blondie, Kaiser Chiefs, Chic and Elbow will also appear at the two day event
The Las Vegas group took to the Wembley Arena stage last night to play on the ITV talent show
The part-animated promo features actors Owen Wilson and Harry Dean Stanton
Band will line-up alongside Elton John, One Direction and Katy Perry for ITV show finale
This year's song is called 'Christmas In LA' and will fatire an animated Warren Zevon
The new song features on their 'Direct Hits' compilation
Drummer Ronnie Vannucci says the Las Vegas band would rather have waited another 10 years