Jennifer Hudson sang Green's classic "Let's Stay Together," leaving many to wonder why the soul legend wasn't singing his own hit for the first couple.
In a statement to The Associated Press, his representative said Green had been asked to sing, but scheduling conflicts prevented him from attending Monday's festivities. Green said he'd be honored to sing for the president in the future.
The Presidential Inaugural Committee did not immediately respond to a request for comment.
Obama famously sang a snippet of the song at an event last year that Green attended.
Nekesa Mumbi Moody is the AP's global entertainment and lifestyles editor. Follow her at http://www.twitter.com/nekesamumbi