On TV: John Mayer, Ashlee Simpson, Nelly Furtado

Pop acts on television this week include John Mayer, who appears on ‘The View’ on Monday; Alanis Morissette, who performs on ‘The Late Show with David Letterman’ on Monday and ‘Live with Regis and Kelly’ on Tuesday; Ashlee Simpson, who appears on ‘Total Request Live’ on Monday; Madonna, who appears on ‘TRL’ on Wednesday; the eliminated ‘American Idol’, who appears on ‘On Air with Ryan Seacrest’ on Thursday; Nelly Furtado, who appears on ‘The Tonight Show with Jay Leno’ on Thursday and ‘On Air’ on Friday; and Avril Lavigne, who performs live on ‘Today’ on Friday.