Yesterday brought word of The Black Keys' May 25 appearance on the Late Show with David Letterman. Today we're happy to report that the band will follow up that appearance with a performance on Late Night with Jimmy Fallon the following night, Wednesday, May 26. It's all to celebrate the release of their forthcoming Nonesuch album, Brothers, on May 18.

Tune in to Jimmy Kimmel Live! tonight to catch Emmylou Harris and Sarah McLachlan perform McLachlan's hit song "Angel." The two are among the many female singer-songwriters and performers slated to tour the US this summer for Lilith Fair 2010. Ticket pre-sales for eight of the tour's 36 cities are available now for subscribers to the Lilith Fair newsletter. Harris's dates have yet to be announced.

Henryk Górecki and Arvo Pärt are the featured composers in the latest episode of BBC Four's Sacred Music, airing Friday. Górecki's Nonesuch catalog includes the famed 1991 recording of his Third Symphony by Dawn Upshaw and the London Sinfonietta, which became the highest-selling album by a contemporary composer, and his three string quartets, each performed by Kronos Quartet. Kronos has recorded Pärt's work for Nonesuch as well, as have Gidon Kremer and the Kremerata Baltica.

Mark your calendars: The Black Keys are slated to perform on the Late Show with David Letterman on Tuesday, May 25, one week after the release of their forthcoming Nonesuch album, Brothers. You can get an early listen to the album's lone Danger Mouse-produced track, "Tighten Up," on the band's MySpace page, which has just been given a timely face-lift to match the vibe of the album art.

Leave Your Sleep, Natalie Merchant's first new album in seven years and her Nonesuch debut, is out now. For the album, Merchant adapts the works of poets into a musically kaleidoscopic, two-disc set of new songs. It was featured on the BBC World Service program The Strand. Now, Merchant offers further insight into the project in a new 10-minute documentary, The Making of "Leave Your Sleep," available at nonesuch.com/media, where you'll also find a video retrospective celebrating Merchant's career.

The Low Anthem's West Coast tour will begin one day later than planned, at LA's Bootleg Theatre tomorrow. Now comes word that The Low Anthem will return to the Newport Folk Festival for the third year in a row, playing the main stage on July 31. Label mates Punch Brothers perform the next day. Discounted tickets are available through Friday. Chris Thile performs at the Savannah Music Festival tonight and will join up with Punch Brothers in Portland, Maine, this weekend.

The Magnetic Fields' Realism tour made its way through England and continues on the Continent for the next week. BBC Manchester spoke with Stephin Merritt, "a brilliant songwriter," for "one of the most honest interviews from a songwriter about how hard it is to work on the art of it." The band's set at London's Barbican Centre elicited "well earned applause," says the Evening Standard's four-star review. The Arts Desk called it "a delightful show ... what a great band; and what a lovely, sad, funny evening."

The Low Anthem's headlining tour of the US is in full swing again following a five-concert run at SXSW in Austin last week. The band performs along the West Coast, starting at Largo in LA. Today is release day for the special limited-edition vinyl 7-inch single of "Charlie Darwin," featuring the Oh My God, Charlie Darwin track plus new and unreleased material. The LAist says the album "spans the gamut of everything you'd want in Americana inspired music." The San Jose Mercury News calls it "hauntingly beautiful."

The Carolina Chocolate Drops, a smash hit at SXSW last week, have returned to their home state of North Carolina and to their roots: the Black Banjo Gathering in Boone, North Carolina, where the band first met back in 2005. The Drops will join in on workshops and performances all week. Rolling Stone says that, as a result of their SXSW performances, "Their newgrass cover of 'Hit ‘Em Up Style' has been upgraded from 'must hear' to 'must experience.'"

Stephen Sondheim's 80th birthday yesterday was celebrated in a big way. The momentous occasion is being acknowledged in many ways, not least in the Nonesuch Store, where the complete catalog of Sondheim CDs is 30% off all week. Last night, at the Roundabout Theater Company's Sondheim 80 gala, it was announced that the Henry Miller’s Theatre on West 43rd Street will be renamed the Stephen Sondheim.

Stephen Sondheim celebrates his 80th birthday today. Nonesuch Records wishes the composer a very happy birthday and is celebrating all week, taking 30% off every Sondheim CD in the Nonesuch Store, from the forthcoming cast recording of the current Broadway revival of A Little Night Music all the way back to Mandy Patinkin's 1995 album Oscar & Steve; from the first musical Sondheim ever wrote, Saturday Night, to his very latest, Road Show.

Wilco begins its 16-concert run of Eastern US cities at The Filmore Miami Beach at the Jackie Gleason Theater tonight. The concerts, presented as An Evening with Wilco, will feature extended, varied sets exploring material from each of the sextet’s seven studio albums. You can relive the live experience with the 2005 live album Kicking Television in a new deluxe, four-LP box set, due out April 17 and now available for pre-order in the Nonesuch Store.