On TV: Janet Jackson, Clay Aiken, Madonna

Pop acts on television this week include Janet Jackson, who visits ‘The Tyra Banks Show’ on Monday; Clay Aiken, who visits ‘The Tyra Banks Show’ on Wednesday; Madonna, who is in concert for her Confessions Tour 2-hour special on NBC on Wednesday; Nelly Furtado, who performs on ‘The Tonight Show with Jay Leno’ on Wednesday and Thursday; John Mayer, who performed on ‘The Late Show with David Letterman’ on Thursday; and Ricky Martin, who performs on ‘Live with Regis and Kelly’ on Friday. In addition, the ‘American Music Awards’ on Tuesday on ABC feature performances by No Doubt singer Gwen Stefani, Nelly Furtado, and The Pussycat Dolls, and presenters including Nicole Richie, Ashlee Simpson, Paris Hilton, ‘American Idol’ alumni Katharine McPhee, Taylor Hicks and Clay Aiken, ‘Hannah Montana’ star Miley Cyrus, JC Chasez, JoJo, Jesse McCartney, The Cheetah Girls, and cast members from ‘High School Musical’.