"It's here," Justin Bieber tweeted. "One of the most important songs to me I've ever written. "In his latest installment of "#MusicMondays," Justin Bieber tackles heartbreak on the acoustic R&B jam "Recovery."

The song samples British singer Craig David's 2000 hit, "Fill Me In."

"At the time [I wrote the song] I was going through a very hard breakup," Justin shared on his website. "And when you're going through stuff like that you think that the world is just gonna end. Then you wake up the next day and realize life has to go on. Recovery is that feeling you get when you start to move on and make things better for yourself, because yesterday is gone and tomorrow is here."