President Barack Obama sings before speaking at a campaign event, Thursday, Jan. 19, 2012, at the Apollo Theatre in the Harlem neighborhood of New York. (Haraz N. Ghanbari/AP)

Obama was in New York City for a slew of fundraisers and was at the famous Apollo Theater in Harlem when he decided to belt out the line “I’m so in love with you.” Green and India Arie had just performed and was in the audience.

Both ‘Al Green’ and ‘President Obama’ are trending Twitter topics. Here’s what some users are tweeting:

What did you think of Obama’s impromptu concert?

Read more on The Root DC

Tuskegee airmen not ‘magic negroes’

Here’s hoping ‘Red Tails’ is a box office hit

First lady catches flack on Twitter

Q&A with Bill Duke on ‘Dark Girls’ documentary

More than a monument: owning our citizenship