Conversation so far:
What happened to the band Sepultura in 2006?
Sepultura's tenth album, Dante XXI, was released on March 14, 2006. It is a concept album based on Dante Alighieri's The Divine Comedy.
Who was Dante Alighieri the person in which Sepultura based their tenth album Dante XXI released in March 14, 2006?
Dante Alighieri was an Italian poet.
Was the band sepultura popular?
Sepultura has sold over three million units in the United States and almost 20 million worldwide, gaining multiple gold and platinum records around the globe
Who was Igor Cavalera from the band Sepultura?
Igor Cavalera is best known as the former drummer for Brazilian heavy metal band Sepultura, which he co-founded with his brother Max in 1984.

Question: Why did he leave the band?
Self-contained rewrite: Why did Igor Cavalera leave the band Sepultura?