TV tonight: 'iHeart' festival, 'Warehouse 13'

• From Las Vegas, look for performances from Taylor Swift, Aerosmith and more
• 'Dancing With the Stars' is stepping lively into Week 2
• Syfy's 'Warehouse' closes the door on the season

iHeartRadio Music Festival
CW, 8 ET/PT

This two-hour TV condensation of the two-night Las Vegas event is scheduled to include performances from Taylor Swift, Aerosmith, Rihanna, Usher, Lil Wayne, Green Day, No Doubt, Pink, Mary J. Blige, Prince and Psy -- of Internet Gangnam Style fame. Oh, and because the special is designed to kick off CW's fall season, cast members from the network's shows will also be on hand. Let's hope they're wearing name tags.

'Dancing With the Stars'
ABC, 8 ET/PT

We're into Week 2 of the "All Star" edition of Dancing With the Stars, which forces one to note that many of these people are stars only if you think appearing on Dancing With the Stars is enough to make a person a star -- which may be true, considering how low reality TV has now set the bar on stardom. Still, as steadfastly cheesy and phony as this show may be, and how unendurable its judging panel most certainly is, Dancing does boast a well-deserved Emmy winner now in host Tom Bergeron, who is frequently the only professional on display. So congratulations to a man who actually does count as a TV star.

'Warehouse 13'
Syfy, 9 ET/PT

In the season premiere of this highly enjoyable Syfy adventure, Artie (Saul Rubinek) was warned that if he used the artifact he discovered, he would create "an evil that will live with you the rest of your days." Or at least the rest of the fall run, which ends tonight with a midseason finale that finds the team trying to stop Artie from succumbing to what he created.