For fans, will the Jackson 4 add up?

The brothers are touring. After Michael's death, they find it a healing experience. But dates were canceled, and Sunday's concert at the Greek is not sold out.

When Jackie, Tito, Jermaine and Marlon bring their "Unity Tour" to the Greek Theatre on Sunday, they will perform hits from the Jackson 5 catalog. They may even bust a few vintage dance moves. But each knows it's going to take a lot more than a rousing version of "Rockin' Robin" to mask the bigger question surrounding the tour: Are they a viable act without Michael?

ed handja