Police are ramping up security ahead of tomorrow's parliamentary elections in Afghanistan, which were originally scheduled for May but were postponed over security and fraud concerns. Extra checkpoints are in place to scan for suicide bombers and insurgents, amid Taliban warnings of attacks targeting voters and election workers. Already 19 deaths have been attributed to election-related violence, including the deaths of four of the 2,500 candidates. We check in with Ben Arnoldy,  South Asia bureau chief for the Christian Science Monitor in Kabul.

Khalid Sheikh Mohammed, the self-described mastermind of the Sept. 11 attacks, is one history's most famous criminals. Unlike Osama Bin Laden, though, Mohammed remains largely unknown. Journalist Terry McDermott dug into Mohammed's biography in The New Yorker and found a terrorist motivated as much by pathology as ideology. McDermott joins us to talk about his new article.

Residents, utility crews and railroad workers are cleaning up debris today after a brief, but fierce storm barreled through New York City, tearing up trees, stripping roofs from homes, disrupting train service and killing at least one person. The National Weather Service planned to spend the day investigating whether a tornado touched down Thursday evening during the storm. Crews at Long Island Rail Road, the nation's largest commuter rail line, worked through the night to clear tracks of fallen debris, but the storm caused chaos for commuters. Tornadoes are extremely rare in New York City, with just eight twisters hitting the city in the past 60 years. Ruschelle Boon of NY 1 joins us from Queens with an update.

Harrisburg University of Science and Technology in Pennsylvania became the butt of late-night jokes this week with its one-week blackout of instant messaging, Twitter, MySpace and Facebook. Students will be required to write a reflective essay about the experiment. We speak with Pavithra Vaideeswaran, a senior who will be graduating this December with a degree in computer science information, who finds the experiment valuable.

Most Americans discovered the music of A.R. Rahman when he won two Academy Awards for his score to the film "Slumdog Millionaire." In India, he's been a superstar for years and written music for more than 100 films. We speak to Rahman about his work and his thoughts about being a devout Muslim touring the United States during this time of heightened tension about Islam.

Sunday is "Frank Zappa Day" in Baltimore, the city where the late musician was born. Zappa is being honored for his music and, on the 25th anniversary of his testimony in Congress against music censorship, for his defense of First Amendment rights. We talk with Zappa's widow, Gail Zappa, about her late husband's legacy.

• Massive Attack, "Pray for Rain"
• The Wee Trio, "About a Girl"
• Dean & Britta, "Herringbone Tweed""
• Art Blakey, "C.O.R.E."
• Freddie Hubbard, "Little Sunflower"
• "Jai Ho" by A.R. Rahman, Sukhvinder Singh, Tanvi Shah, Mahalaxmi Iyer, Vijay Prakash
• "Choti Si Aasha" Minmini, A.R. Rahman
• "O Saya" by M.I.A., A.R. Rahman
• "O Paalanhaare" music by A.R. Rahman, performed by Lata Mangeshkar, Sadhana Sargam, Udit Narayan
• "Kehna Hi Kya" by Chitra and A.R. Rahman