KT Tunstall
KT Tunstall Wikipedia
While recently booming in popularity in North America, KT's Eye to the Telescope has been on my playlist for a few years now. One thing that always stood out to me was her use of a Loop Pedal during live performances so I'll add a few clips of those.
I especially love her Jackson 5 cover of I want You Back, even though she has a false start with her pedal.
KT Tunstall - I Want You Back (Jackson 5 cover)
Her most famous song has to be Black Horse and the Cherry Tree.
KT Tunstall - Black Horse and the Cherry Tree
A more quiet song, non-live performance:
KT Tunstall - Under the Weather