Horslips
Irish band, generally regarded as the first Celtic-rock group, originally active (initially as Horslypse) 1970 - 1980, reuniting 2004-2006 and 2009-2012.
A note on CD editions:
When Horslips split in 1981, the rights to their back catalogue were sold to Outlet Records without the band's consent. Outlet reissued all the albums on vinyl, cassette and eventually CD over the following years. The original CD reissues, released in conjunction with Homespun Records, are direct transfers (no mention of remastering on the covers). Later Outlet reissues were remastered and included improved artwork.