Usher, Katy Perry and the cast of 'Glee' were among the pop stars booked to mark the start of President Obama's second term.
The official inauguration will take place on Monday, but the celebrations started last night with a Kids' Inaugural Concert for children and military families in Washington DC.
Beyoncé, Kelly Clarkson and James Taylor are expected to sing at the president's official inauguration.
Beyonce "lip-synched" the national anthem at President Obama's inauguration because she did not have time to rehearse with the band.
A day of grand political theatre lies ahead, but President Obama knows his history and will be steeling himself for a turbulent second term.
Presidential inaugurations are normally highly scripted events, but things don't always go according to plan.