Chris Brown is among the artists who'll be performing at the Michael Jackson tribute concert in Vienna.
Michael's brother Jermaine said up to 25 performers had been lined up, including rapper Akon, Mary J Blige, Sister Sledge and Natalie Cole.
They'll be singing some of Michael Jackson's greatest hits, including Thriller and Billie Jean.
Jermaine also announced his own plans to sing a virtual duet with his brother, who died in June.
About 65,000 fans are expected to attend the tribute concert in front of Vienna's former imperial Schoenbrunn Palace on 26 September.
Jermaine said the venue had been chosen because his brother "loved castles".
Chris Brown has performed a tribute to Michael Jackson in the past. In 2006, he stood in Jackson's shoes to perform a tribute to Thriller at the World Music Awards in London.
More recently, the singer was sentenced to 80 days' community labour for assaulting his pop star ex-girlfriend Rihanna.