Artists including R&B stars Mary J. Blige, Akon and Chris Brown as well as veterans Natalie Cole and Sister Sledge will perform at the Vienna Michael Jackson tribute concert later this month, organizers said on Tuesday.

Thirteen artists so far have been confirmed to perform at the concert, set in front of Vienna's Schoenbrunn castle on September 26, Michael's brother Jermaine Jackson and producer Georg Kindel told reporters at a news conference in Vienna.

Jermaine will sing a virtual duet with his late brother, who died from a drug overdose on June 25 and will be brought to life by video projections on the concert stage.

All the artists will sing Michael Jackson's greatest hits and will be supported by the band and dancers which were to accompany Jackson on his planned "This Is It" series of comeback concerts in London before the king of pop died in June.

In a grand finale, all of them will sing "We Are The World" and "Heal The World" together, Kindel said. Jackson's children and his mother Katherine will also be in Vienna.

A total of 20 to 25 artists are expected for the concert. More names will be revealed at separate news conferences in London on Wednesday and in Berlin on Thursday, Kindel said.

Tickets for the concert are being sold in stages for 63 to 518 euros ($91-$745) each. More than half have been sold.

(Reporting by Petra Spescha; writing by Boris Groendahl, editing by Paul Casciato)

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