It's the Great Pumpkin, Charlie Brown (8pm, ABC) - In this 1966 classic, the Peanuts gang celebrates Halloween with Linus hoping he'll be visited by The Great Pumpkin.

Community (8pm, NBC) - Britta fears someone in the group is a sociopath after her anonymous personality test turns up with unsettling results. In order to find out who's disturbed, she and Jeff persuade the gang to tell horror stories.

Parks and Recreation (8:30pm, NBC) - Andy and April host a Halloween party at their house and Tom emcees an event for Leslie's campaign.

Project Runway (9pm, Lifetime) - In the Season 9 finale, the final designers frantically ready their collections in a bid to be the best at Fashion Week. Designer L'Wren Scott is the guest judge.

The Secret Circle (9pm, CW) - Cassie throws a Halloween party, but it takes a dangerous turn when some uninvited guests who have their sights set on the circle show up.

Prime Suspect (10pm, NBC) - As Jane investigates the murder of a young woman whose body was found in the park, Duffy and Evrard search for the stepfather of the murder victim.

The Mentalist (10pm, CBS) - A police chief is murdered in a resort town, and the case leads Lisbon to reunite with her brother, a bounty hunter who's searching for a bail-jumper.

I've been watching "It's the Great Pumpkin, Charlie Brown" since I was a kid, and wondering about the source of one particular sound effect in it. There's a scene where Snoopy is in his role as World War I flying ace, shot down behind enemy lines and furtively sneaking around -- to the soundtrack of a moody and quiet flute, accented by a high-pitched, almost screechy noise. Saturday night, I learned how you get that sound courtesy of Dave King, drummer for The Bad Plus: You rub a drumstick around the top edge of a cymbal in a circular motion. Presto!

Something else I learned from The Bad Plus at last night's show is that it really is possible for three people to pull off "The Rite of Spring." This was the world premiere of the Minneapolis jazz trio's version of the 1913 Stravinsky masterwork, which they've been laboring on for the past year, and it was impressive. Most of the heavy lifting fell to pianist Ethan Iverson, who had to replicate or at least suggest the piece's signature melodic elements enough to be recognizable. But all three of them played amazingly, filling in the spaces of music usually rendered by scores of musicians in orchestras.

No, I don't know "The Rite of Spring" backwards and forwards... Okay, I'll admit my knowledge of it basically comes from Walt Disney's "Fantasia." But they did a fantastic job of capturing the essence and full sweep of the piece, as this lay listener knows it.

"Piece o' cake, piece o' cake," Iverson quipped afterward. Maybe I was imagining it, but the posture of all three players suggested relief as they took their bows.