Joseph Biden retook the oath of office, and expanded statement, from Justice Sotomayor, at 11:55 AM, and at high noon, President Barack Obama took the public oath, a shorter sentence, from Justice Roberts.
Some commentators compared him to Ronald Reagan, who emphasized individualism, by adding the importance of unity and collective action together.
Obama emphasized the importance on acting on climate change, so that we do not steal the planet from future generations or the unborn (turning conservative arguments on themselves). He said that the free market needs consistent rules (regulation) to ensure a fair (and "just") playing field.
Kelly Clarkson sang "God Bless America". Beyonce sang the National Anthem, with a little embellishment at the end. There has been some controversy over whether Beyonce pantomimed the anthem from a recording, and whether the Marine Corps band, which had little time to prepare, did the same.
Poet Richard Blanco read the text of his "One Day" (here).
Later, on his own AC360, Anderson would explain that in the 1960s gays were not allowed even to congregate in bars without being harassed, and this changed quickly after Stonewall. (There were, however, police false arrests in Dallas gay bars as late as 1980, when I was living there.)
The parade included the Lesbian and Gay Band Association (LGBA), in purple.