There is more than one act of this name:
1) Barker is an alias of Berlin-based dance music producer Sam Barker (aka Voltek). He has released one solo EP, 'Like An Animal', and a number of other releases with Andy Baumecker as Barker & Baumecker.
2) Barker is a post-hardcore band from Leicester, England. They have released one EP, 'Barker Bloody Barker', through Bandcamp. Read more on Last.fm