Ellen Gray's weekend TV picks

* BOARDWALK EMPIRE. 9 p.m. Sunday, HBO.

As "Boardwalk Empire" strays from its Atlantic City roots, I grow less interested in the travails of Nucky Thompson. But Season 4 is rich with storylines for supporting characters like Chalky White (Michael Kenneth Williams) and Nucky's valet Eddie Kessler (Anthony Laciura).

* LAST TANGO IN HALIFAX. 8 p.m. Sunday, WHYY12.

Like PBS' "Call the Midwife," this series about a widower (Derek Jacobi) and widow (Anne Reid) reigniting a teenage romance 60 years later via Facebook isn't nearly as old-fashioned as it might look, refusing to smooth over the very real differences of the couple and their complicated families.

* THE ALL-STAR ORCHESTRA. 12:30 p.m. Sunday, WHYY12.

Here's an all-star team where Philly's extremely well-represented. Composed of musicians from across the country, this PBS series features several members of the Philadelphia Orchestra, including concertmaster David Kim, as well as faculty members from Temple, the Curtis Institute and Settlement Music School. In the premiere, the all-stars tackle Igor Stravinsky's "Suite from the Firebird," Maurice Ravel's "Daphnis and Chloe Suite No. 2" and Bright Sheng's "Prelude to Black Swan."

* PBS NEWSHOUR WEEKEND. 5:30 p.m. Saturday and Sunday, WHYY12.

It's only a half-hour, but PBS' "Newshour" expands to Saturdays and Sundays this weekend, with Hari Sreenivasan as anchor.