Performances will be available digitally after each event concludes
Pop stars expected to play two hits, including 'Wannabe'
California musician claims pop star stole for her hit single 'Domino'
Plus: A sales low in Soundscan history
Other winners include Rihanna, Adele, Tinie Tempah
British pop singer is first of four mentors announced
Lady Gaga's gender-bending Jo Calderone, pregnant Beyoncé, 'mature' Justin Bieber and more
Plus: Stream new music from TV on the Radio, Panda Bear, Paul Simon, Alison Krauss, Jessie J and Thurston Moore
British singer performs new hit 'Price Tag' with B.o.B.
Also: Watch performances from last night's ceremony
Plus: New music from the Strokes, PJ Harvey, Robbie Robertson and the Dirtbombs