What's On Tonight: Nashville Star, Middleman, Weeds

• The Discovery Channel's Shark Week continues.
• At 8, ABC has a new High School Musical: Get in the Picture, followed by new episodes of Wanna Bet? and The Mole.
• NBC has a new American Gladiators at 8, then new episodes of Nashville Star and Dateline.
• TCM has a new Under The Influence at 8, featuring Quentin Tarantino.
• At 9, PBS has a new History Detectives.
• TNT has a new episode of The Closer at 9, then a new Saving Grace.
• There's a new Monday Night RAW on USA at 9.
• GSN has a new World Poker Tour at 9.
• At 10, ABC Family has a new Middleman.
• Food Network has a new Diners, Drive-Ins, and Dives at 10.
• Showtime has a new Weeds at 10.
• Also at 10: Travel Channel has a new Anthony Bourdain: No Reservations.

Check your local TV listings for more.