"It Has Been So Long" was more than just a comeback single; it was a game-changer. The song's success can be attributed to its infectious beat, which blended elements of hip-hop, R&B, and pop. The lyrics, which speak to the longing and yearning for a loved one, resonated with fans worldwide. The song's impact was felt across the globe, with many regarding it as one of the best songs of 2008.