Highlights: January 15-21

Masterpiece at 8 p.m. Sunday and 8 p.m. Saturday presents part two of “Downton Abbey, Series II”. Downtown is turned into a convalescent home with Thomas in charge. Meanwhile, Lavinia and Sir Richard’s secret comes out, Anna tracks down Bates and Branson seizes his chance to strike a blow for Ireland.

Sherlock Holmes stalks again on Masterpiece Mystery! at 9 p.m. Sunday in a thrilling contemporary version of the Victorian-era whodunits. When an unidentified woman, dressed all in pink, turns up murdered in an abandoned building, Sherlock must use the science of deduction to catch the killer on “Sherlock: A Study in Pink”.

Hosted by President and Mrs. Obama in the East Room of the White House, “In Performance at the White House: A Celebration of Music From the Civil Rights Era” at 9 p.m. Monday features popular musicians performing contemporary arrangements of music that galvanized the U.S. civil rights movement of the late 1950s and 1960s.

American Experience presents “Custer’s Last Stand” at 7 p.m. Tuesday about General George Custer and his place in American history.

Broken Tail was the most charismatic tiger cub ever seen in Ranthambore, one of India’s best protected tiger reserves, but suddenly and without warning Broken Tail abandoned his sanctuary and went on the run. Follow his final journey on Nature at 7 p.m. Wednesday.

With excellent 3D graphics, Nova at 8 p.m. Wednesday tells the suspenseful, previously untold story of air photo intelligence that played a vital role in defeating Hitler on “3D Spies of WWII.”

Veterinary scientist Mark Evans and comparative anatomist Joy Reidenberg dissect a sperm whale’s enormous organs to reveal the secrets of this 45-foot deep-sea giant on “Inside Nature’s Giants: Sperm Whale” at 9 p.m. Wednesday.

Alternative rock superstars Arcade Fire return to the ACL stage for the second time to perform hits and tunes from their Grammy-winning LP “The Suburbs“ on Austin City Limits at 10 p.m. Wednesday and 9 p.m. Friday.

Singer and songwriter Jeff Tweedy, the frontman of Wilco, discusses his musical career on Overheard with Evan Smith at 7 p.m. Thursday.

World-renowned classical guitarist Jorge Caballero performs the classic work Pictures At An Exhibition by Modest Mussorgsky on Arts In Context at 7:30 p.m. Thursday.

Join Chet Garner as he travels to Lockhart, Texas to conquer all four of the local Que joints in the BBQ capitol of Texas on The Daytripper at 8:30 p.m. Thursday.

Independent Lens at 9 p.m. Thursday presents “Have You Heard From Johannesburg?”, a mini-series that chronicles the unprecedented international movement of citizen activists who fought for three decades to bring down the brutal, racist system of apartheid in South Africa when their governments would not.

Folk meets indie rock with Fleet Foxes and Joanna Newsom as they both make their debut performances on Austin City Limits at 7 p.m. Saturday.