But the two musicians got over their differences last Monday as they came together in a studio in Los Angeles to record an album to raise money for Haiti.
Many artists turned out to 显示 support, including: the Jonas Brothers, Miley Cyrus and Justin Bieber who sand together "We are the World" 由 Michael Jackson.
In the 1980's this song was used to help raise money for children in Africa. NOw it is being used for Haiti.
Here we have for 你 a few 照片 of this amazing recording session. All of the musicians leaving their bad vibes outside and working together for a good cause.