<i>Gossip Girl</i> Gossip Girl
Gossip Girl9/8c CW
NYC natives Sonic Youth perform in this episode, which focuses on the nuptials of Lily and Rufus. These two have overcome so much on their tumultuous road to the altar, including the disapproval of her family, a secret pregnancy, years spent apart, other marriages and their kids dating. But now that all that's behind them, surely their wedding day will go off without a hitch, right? Not if Georgina spills Scott's secret, which she threatens Vanessa she will do if Dan doesn't stop seeing Olivia. — Jennifer Sankowski

CSI: Miami10/9c CBS
The series often lifts stories directly from the headlines, and so it is with this episode, which features a Bernie Madoff-like investor who steals people's life savings. You could say their money is down the toilet. How fitting then that the man who robbed so many of their financial futures is found submerged in his plane's toilet. Or at least his decapitated head is discovered there. The CSIs not only try to find the killer but also recover what's left of the man's ill-gotten loot. — Tim Holland

Yo Gabba Gabba!1/12c NICK JR. When learning about family trees, who better to lend a hand then the Roots? They perform "Lovely, Love My Family" as the Gabba gang welcomes Muno's relatives for a visit. DJ Lance's sister also stops by, and DJ Lance reflects back on what his pals looked like as babies. Families are the focus as the gang sings songs such as "Meet My Family." Additional new episodes of the series air through Friday. — Jennifer Sankowski

Little People, Big World
TLC While Jon and Kate continue to make headlines, TLC's favorite non-dysfunctional family returns for another season of Roloff family fun. Season 5 kicks off with a determined Matt ready to finally finish Molly's Castle, his most drawn-out (and costly) farm attraction, which is already 10 years in the making. A second new episode follows at 8:30 pm/ET, and it follows Molly as she prepares for her first high-school formal, which happens to be Zach and Jeremy's last. — Karen Andzejewicz

Latin Music USA
9/8cPBS (check local listings)
The history and influence of Latin music in the U.S. opens with "Bridges," which recalls the rise of Latin jazz, the mambo and cha-cha, and its impact on R&B and rock music through the 1960s. Then, "The Salsa Revolution" explores the NYC origins of salsa, which blended soul and jazz with the plena and son cubano music genres native to Puerto Rico and Cuba. — Jeff Gemmill