Pop superstar Lady Gaga performs a rendition of “The Star Spangled Banner” at the inauguration of President-elect Joe Biden and Vice President-elect Kamala Harris.

Amanda Gorman, a 22-year-old poet, read an original work at President Joe Biden’s inauguration on Jan. 20. After Biden was sworn in as the nation’s 46th president, Gorman read “The Hill We Climb,” building on a tradition of poets -- including Robert Frost, Maya Angelou, Elizabeth Alexander and Rich

Katy Perry performed hit song 'Firework' in the inauguration concert of US President Joe Biden and Vice President Kamala Harris. (Video: Biden Inauguration Committee)

Great performance by Demi Lovato during the Biden/Harris Presidential and Vice Presidential Inauguration. OMG!!! This makes me beyond HAPPY!!!!! Welcome back, America!!!!

Singer Jennifer Lopez performs at the inauguration of Joe Biden and Kamala Harris.

Three presidents of the United States of America: one message of unity.Watch Presidents Barack Obama, George Bush, and Bill Clinton's special message to President Joe Biden.

President Obama called for equality for gay and lesbian Americans in his inaugural address: Our journey is not complete until our gay brothers and sisters are treated like anyone else under the law – for if we are truly created equal, then surely the love we commit to one another must be equal as w