Former President Barack Obama arrived at the U.S. Capitol on Monday for President-elect Trump’s inauguration ceremony without former First Lady Michelle Obama.

Michelle Obama was the only spouse absent at the funeral service at Washington National Cathedral, where her husband and Trump were seated next to each other and chatted and laughed like old friends despite the history of political animosity between the Democratic former president and the returning Republican.

President-elect Donald Trump selected opera tenor Christopher Macchio to perform the national anthem at Monday’s inauguration, at which Carrie Underwood will also perform “America the Beautiful.” Here’s a list of some singers at previous presidential inaugurations,