: will.i.am wrote the song in approximately one hour after attending the inauguration of President Obama.

: It runs at 128 beats per minute in the key of G major.

The song's release marked a period of unprecedented chart dominance for the Black Eyed Peas.

: The inclusion of the line "Mazel tov (l'chaim)" helped the song become a global staple at celebrations, particularly bar mitzvahs and weddings. Critical and Commercial Impact

: The song's melody was directly inspired by the U2 song "I'll Go Crazy If I Don't Go Crazy Tonight". Some critics have also noted similarities to the repetitive, warm vocal lines of the Five Stairsteps' "O-o-h Child". Musical Composition