There is more than one artist with this name:
1) The Lost Brothers is an Irish musical duo consisting of Mark McCausland and Oisin Leech, formerly of The Basement and The 747s.
2) The Lost Brothers are Brighton-based DJs and producers Harry Diamond, Keiron McTernon and Sergei Hall
(1) The Lost Brothers are Mark McCausland and Oisin Leech.
They released their debut album 'TRAILS OF THE LONELY (parts I & III)' on November 17th 2008.
SInce then they have performed at Glastonbury 09 and played shows with Richard Hawley, M Ward and Jolie Holland. Read more on Last.fm