Conversation so far:
How did the Horslips return?
In March 2004, three Horslips enthusiasts, Jim Nelis, Stephen Ferris and Paul Callaghan, put on an exhibition of Horslips memorabilia in The Orchard Gallery in Derry.
Did Horslips release any albums after the return in 2004?
Horslips returned to the studio in Westmeath to produce a studio album.
What album did the Horslips release in 2004?
Horslips released Roll Back, in the summer of 2004.
Did Horslips play live after their return in 2004?
The exhibition moved to Drogheda in October 2005, courtesy of longtime fan Paddy Goodwin, and was formally opened on 6 October by a tribute band, Horslypse.
Did Horslips do a tour for their 2004 album, Roll Back?
The exhibition moved to Belfast in February and March 2006 and there were plans for a New York showing in 2007.

Question: What kind of songs were there in the horslips unplugged?
Self-contained rewrite: What kind of songs were there in the described “Horslips Unplugged”?