"I Swear" is the second overall single released by English hip hop trio, N-Dubz under their self-funded record label. It was released on September 12, 2006 as their first mainstream release. The maxi single is the only single by N-Dubz that is available on the US iTunes Store. The track later featured on the group's debut album, Uncle B, more than two years after the single was originally released.

"I Swear" was written, produced and released by N-Dubz during 2006. With Jamior Edwards being credited as the track's co-producer. The general style of the song is an upbeat hip-hop backing combined with the soulful vocals of Tulisa and the intensive rapping of Dappy forming an original British hip-hop grime track which's style is reflected in the forthcoming album tracks and singles that appeared on N-Dubz's debut album "Uncle B". The song prominently features the two more common participants of N-Dubz in the singing and rapping of their songs: Tulisa and Dappy, with Fazer featuring as backing vocals and/or grunting throughout the song as well as in the final verse where he raps about how he caught his girlfriend cheating on him when he arrived home from tour. The first verse is rapped by Dappy with Tulisa in backing. This follows onto a call and response chorus between both Dappy and Tulisa. Verse two is led by Tulisa with Dappy in backing and the track is called-out with N-Dubz's signatures call-outs "It's N-Dubz N-Dubz, what ye, it's N-Dubz N-Dubz, two thousand and sexy naa naa nii" - rapped by Dappy and "Uh-oh uh-oh" sung by Tulisa. The song's general theme involves infidelity, a theme which is later followed on by the group's 2008 single "Ouch". The song, through its lyrics, tells a story about how a man discovers that after his girlfriend starts regularly giving him the cold shoulder that she's in fact cheating on him. It's mentioned that he sees his girlfriend kissing another guy under a bridge and when he arrives home from tour he suspiciously finds a pair of Nike shoes that don't belong to him whilst his girlfriend is at home. The story of the lyrics goes on into an argument between the couple and the girlfriend admits that she didn't go chillin' with her girl-friends but did, as accused cheat on him. She states her reason for this as him not giving her enough love and she however consistently apologizes to him through the progression of the song and its lyrics. "I Swear" has also been featured as the concert opening track on N-Dubz's setlist for their Uncle B Tour.

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