Justin Bieber just released another promised single titled, "Roller Coaster". Justin Bieber has reportedly promised that he would release a new track every single day of the week, and "Roller Coaster" makes the eight single thus far. The new up-beat pop song is alongside singles such as 'All Bad' and 'Recovery'.The single was released today while Bieber is currently on tour in  Austraila. The pop star sings, "It's nights like these that I never ever missed you more....Only overseas, only memories, wish I had the key to your heart," he belts during the chorus of "Roller Coaster". There has been no official word if he is talking about his former ex-Selena Gomez, or just a pop love song.  Justin Bieber also released a single that featured R.Kelly during the track titled, "PYD", which accordingly to the lyrics standed for 'put-you-down'.

Justin bieber stated that "Roller Coaster" is a song about life- and the ability to move on from certain obstacles in life. "Just like in life, relatonships have ups and downs. Working on this song I really was just trying to capture that feeling. You just always have to remember that even when things feel like the are at a low point, you will make it back up again."Justin Bieber has been on his "Believe" World Tour, as well as promoting for his new movie, "Believe", which will appear in theatres Christmas Day. You ca download Justin's new single on on iTunes. To find out more information on his "Believe" tour or movie, go here.