Next week, one of the final four Rockers will stand in front of INXS and sing a brand-new song. And if they want to be that person, Kirk tells them, this week their performances will have to shine. There's no margin for error: the Rockers will each perform two songs chosen by INXS to test their mettle. Plus, Dave Navarro, who has been mentoring the Rockers for the past 10 weeks, will add his distinctive guitar playing to one of each of their songs this evening.

Before they get to the singing, the Rockers have some explaining to do. Dave has a few questions for them about their one-on-one interviews with INXS.

Was Marty worried that he might have come on too strong in telling INXS his plans for the band's future? "It's not about control," Marty tells Dave and INXS, but "laying all my cards on the table and hoping they respect me." Tim says the band does respect his frankness, adding that to stay fresh, INXS has to be "open to new things."

Did MiG view his lack of time spent in the bottom three as a blessing or a curse? Neither, MiG says, but his popularity with the voters (and, he adds pointedly, the record-buying public) sends a strong message to INXS that the fans think he's the right man for the job.

MiG might think the fans want the right man, but Dave asks Suzie why she thinks INXS should choose a female vocalist. She answers that it's not about being a man or a woman -- it's about finding the right singer.

Finally, Dave wants to know where the vulnerable J.D. has been -- the side he showed when his mother and sister surprised him with a visit at the Mansion. "It's always been here," J.D. says, but it took his family to bring it out.

With the questions answered, it's time for the Rockers to give INXS a show, and this week Suzie kicks off the performances. For her, the challenge is to prove to INXS that a woman can rock just as hard as a man. "Interstate Love Song" gives her a chance to do just that. The Stone Temple Pilots' hit song has a great guitar riff (which Dave, of course, nails), but the melody stands or falls depending on the singer's attitude. Suzie shows herself more than up to the task, giving the song a husky reading. Her growing confidence as a performer is also showcased as she interacts with Dave and the House Band and as she runs into the crowd.

Having the Rockers sing two songs in a row also gives INXS a chance to see how smooth and poised they are talking to an audience. This is a test Suzie also passes when introducing her second number, 4 Non Blondes' "What's Up," as a song that is right for a time when we "need to be aware of what's going on."

Dave says he loved performing with his "Sweet Suzie" and is impressed with the way she worked the crowd. "Did you see how into the song they were?" he asks. Garry calls it a "world-class performance." Tim thinks she handled both songs really well, adding that he was also impressed with how she handled the crowd.

Dave gets back onto the stage to back J.D. up on "Pretty Vegas." The song has been one of the most popular downloads on MSN Music. What's impressive is that although this is the third time it's been performed on the "Rock Star:INXS" stage, J.D. makes it sound fresh and spontaneous, which is a talent that would come in handy on a world tour, where a band has to play the same song night after night. On Pink Floyd's "Money" -- the second song INXS chose for J.D. to sing this evening -- J.D. not only shows he's enough of a musician to handle the song's tricky timing, he's also self-assured enough to engage in some shrewd stagecraft, tossing a bagful of fake cash into the crowd.

Dave tells J.D. he enjoyed rocking his way through "Pretty Vegas," a song Kirk admits he can't get out of his head. Tim says J.D. pulled it off, adding he thought J.D. was clever to toss money into the crowd. Tim jokes that if J.D. can afford to throw money around like that, then INXS won't have to pay him. Dave assures J.D. that if he keeps performing like that he won't have to worry about money anyway.

Marty sees the songs INXS chose for him as a test of his range. "Trees," the song he premiered during the songwriting clinic, is happy and upbeat, whereas Radiohead's "Creep" is dark and moody. He makes the two songs sound even more diverse by choosing to perform "Trees" as an acoustic duet with Dave. But whereas INXS threw the other Rockers curveballs for their second songs, with "Creep" they tossed Marty a fat pitch right down the middle of the plate. It's the kind of modern rock Marty excels at, and he certainly hits the song out of the park with an impassioned, perfectly controlled performance.

Garry congratulates Marty for taking a chance and succeeding; you know a song is good when it works in an acoustic setting. He also thanks him for a great performance of "Creep."

MiG knows that INXS asked him to sing The Rolling Stones' "Paint It Black" because they wanted to see his darker side. They've also let him know that his theatrical background has them worried. MiG takes a calculated risk by rearranging a song INXS specifically chose for him. His arrangement of one of the most intense songs in The Stones' catalog changes the song's melody and dynamics, making it even more dramatic. He plays it safer with Seal's "Kiss from a Rose." Kirk asks MiG if he was happy with the songs that INXS selected for him. MiG says he is -- "Paint It Black" is his favorite Stones' song. Garry says he's sad that MiG's never been in the bottom three, because INXS hasn't had a chance to hear him sing their songs. And this performance, he adds, should keep him safe for another week. Dave says that just to make sure, MiG should take off his jacket to get more votes. MiG does, to the fans' delight.

Will MiG escape being in the bottom three? Who will end up as the Rocker who gets the most votes this week, guaranteeing a spot in the finale? And who will INXS send home? To find out, tune in to CBS Wednesday at 9PM for the final elimination show, and don't miss the "Rock Star:INXS" finale on CBS Tuesday, Sept. 20, at 10PM (all times ET/PT).