sentence: tunstall is known for her live performances , in which she combines use of an akai e2 headrush loop pedal , which she affectionately calls '' wee bastard '' , with a full four-piece backing band ( luke bullen on drums , arnulf lindner on bass , sam lewis on lead guitar and kenny dickenson on keyboards , trumpet , percussion and various other instruments ) , as well as her two backup singers ( cat sforza and ami richardson ) similar to her initial début on music show later ... with jools holland , tunstall débuted in the united states performing on various talk shows , although it was not until the ellen degeneres show that she was interviewed .