What: Pitchfork Music Festival
Where: Union Park, 1501 W. Randolph St.
When: 3 p.m. Friday, 1 p.m. Saturday and Sunday
What: 46 bands/artists, three stages, hosted by e-zine pitchfork.com
Tickets: Ticketweb.com ($50 one-day pass)
G = Green Stage, B = Blue Stage, R = Red Stage
XXXX = Must-see sets
XXXX 8:30 p.m., Björk (G): The Icelandic maverick’s latest album, “Biophilia” (2011), is a multimedia project that transformed her into the world’s wiggiest science teacher. She rarely plays it safe in concert, either.
7:20 p.m., Joanna Newsom (R): Virtuoso harpist with an eccentric voice and elaborate fairytale songs. A fitting match for Bjork.
XXXX 6:25 p.m., Wire (G): U.K. postpunks released three revolutionary albums in the ‘70s, took a hiatus, and are now back in high gear, caustic and cutting as ever.
6:15 p.m., Mikal Cronin (B): Ty Segall’s right-hand man in the San Francisco garage-punk scene brings the acid-dipped tunes on his second solo album, “MCII.”
5:30 p.m., Woods (R): The Brooklyn folk-rockers are now seven albums deep into a career that mines the spookiest corners of traditional music.
XXXX 5:15 p.m., Angel Olsen (B): A glistening voice and stripped-down songs bring the drama at its most intimate.
4:35 p.m., Mac DeMarco (G): This Canadian singer-songwriter plays it slapdash and low-fi on record, but can get boisterous and lewd on stage. R. Kelly may not be the only singer getting explicit in Union Park this weekend.
XXXX 4:15 p.m., Trash Talk (B): The interracial California hardcore band put out an album last year on the Odd Future hip-hop collective’s label.
XXXX 3:30 p.m., Daughn Gibson (R): The Pennsylvanian sings with baritone authority and spreads desolate atmosphere over eerie electro-beats.
3:20 p.m., Frankie Rose (B): A former member of Vivian Girls, Dum Dum Girls and Crystal Stilts, the singer is now carving out a distinctive pop persona on her solo albums.
8:45 p.m., Rustie (B): The U.K. electronic composer massages hooks out of thick clusters of sound.
8:30 p.m., Belle & Sebastian (G): The once-wispy Scottish folk-rockers haven’t exactly turned into Slayer, but they’ve toughened up their sound and amped up the dance pulse on recent releases while maintaining their allegiance to melody.
7:45 p.m., Andy Stott (B): The British DJ brought a new luster to his dark electronic music last year on “Luxury Problems.”
XXXX 7:25 p.m., Solange (R): Beyonce’s sister edges toward the darker, trippier fringe of R&B.
XXXX 6:45 p.m., Low (B): The Minnesota co-ed trio specializes in slow-burn loveliness with a subversive twist.
6:15 p.m., the Breeders (G): Kim Deal, Kelley Deal, Josephine Wiggs and Jim Macpherson regroup to perform their alternative-rock era landmark, “Last Splash.”
5:45 p.m., Ryan Hemsworth (B): The former Canadian singer-songwriter has transitioned into adventurous hip-hop and electronic production, remixing and composing.
XXXX 5:15 p.m., Swans (R): Michael Gira’s ensemble was at the forefront of the most punishing brand of no-wave out of New York in the ‘80s; in its second incarnation, Swans delivers sweeping, orchestral beauty and chilling melancholy.
XXXX 4:45 p.m., Metz (B): No one will sweat and grind more for your listening pleasure this weekend; this Toronto art-punk trio is not to be missed.
XXXX 4:15 p.m., Savages (G): The U.K. quartet’s debut, “Silence Yourself,” is among the year’s best. The live show is even better, with incisive lyrics and lacerating songs.
3:45 p.m., Merchandise (B): Prolific Florida trio delivers the brooding tunes cloaked in moody, electronic haze – like late ‘80s dream pop never died.
3:20 p.m., ...And You Will Know Us By the Trail of Dead (R): Ambitious arrangements and unflagging intensity have kept this band – originally from Austin, Texas -- buoyant for nearly two decades.
XXXX 2:50 p.m., Parquet Courts (B): Pithy, guitar-driven songs with lyrics zeroing in on the no-fly zone between adolescence and adulthood.
2:30 p.m., Phosphorescent (G): With his wobbly, country-tinged vocals and evocative electronic textures, Matthew Houck delivers a distinctive take on musical Americana.
XXXX 1:55 p.m., Julia Holter (B): The classically trained multi-instrumentalist dips a toe in pop as she artfully blurs genres and eras.
1:45 p.m., Pissed Jeans (R): Industrial screed, ranting cacophony, a frontal assault – this early-afternoon set will turn a hangover into a migraine.
1 p.m., KEN Mode (B): The acronym stands for “Kill Everyone Now,” which pretty much sums up this Canadian underground metal trio’s tone and attitude.
XXXX 1 p.m., White Lung (G): Co-ed Vancouver band injects high-octane punk with catchy hooks.
8:45 p.m., TNGHT (B): The duo’s blend of electronic music and hip-hop has earned the endorsement of Kanye West.
XXXX 8:30 p.m., R. Kelly (G): The dominant R&B singer-songwriter-producer-performer of the last 20 years, Kelly is a controversial headlining choice because of a 2008 trial in which he was acquitted on child-pornography charges.
7:45 p.m., Glass Candy (B): Johnny Jewel’s beats underpin the idiosyncratic vocals of Ida No.
XXXX 7:25 p.m., M.I.A. (R): Expect the Sri Lankan-born agit-rapper to debut some new tracks from her forthcoming fourth studio album.
6:45 p.m., Evian Christ (B): The British electronic artist traffics in avant-garde textures and abstract sound collages.
6:15 p.m., Toro Y Moi (G): Chaz Bundick works the divide between songs and atmospherics with R&B inflections.
XXXX 5:45 p.m., Chairlift (B): Brooklyn-via-Colorado duo Caroline Polachek and Patrick Wimberly have given new life to synth-pop by blending three decades’ worth of influences.
XXXX 5:15 p.m., Lil B (R): MC Brandon McCartney has made thousands of tracks available on-line since going solo after a stint in the Pack, and many of them are terrific.
4:45 p.m., Sky Ferreira (B): The former teen-pop singer turned a corner last year with the hit “Everything is Embarrassing.”
XXXX 4:15 p.m., Yo La Tengo (G): The veteran indie-rock trio recently released one of their best albums, “Fade.”
XXXX 3:45 p.m., Waxahatchee (B): Katie Crutchfield’s introspective songs burst into the sunlight on her excellent second album, “Cerulean Salt.”
XXXX 3:20 p.m., El-P (R): The MC and producer is on a roll with last year’s ominous “Cancer 4 Cure” and this year’s boisterous collaboration with Killer Mike, “Run the Jewels.”
2:50 p.m., Blood Orange (B): Producer/songwriter/remixer extraordinaire Devonte Hynes (Basement Jaxx, Solange Knowles, Phoenix) also sings and performs his own brand of edgy new wave.
XXXX 2:30 p.m., Killer Mike (G): The Atlanta MC is finally being recognized as one of hip-hop’s most distinctive voices, thanks to “R.A.P. Music” (2012) and “Run the Jewels” (2013). Let’s hope he and his recent collaborator El-P find a way to join forces on stage.
XXXX 1:55 p.m., Autre Ne Veut (B): On his excellent recent album, “Anxiety,” Arthur Ashin adds a new dimension to the recent wave of skewed R&B.
1:45 p.m., Foxygen (R): Los Angeles rockers reference the past, tightroping the line between imitation and renewal.
1 p.m., DJ Rashad (B): One of the pioneers of Chicago’s juke music scene.
1 p.m., Tree (G): The 2012 “Sunday School” mix tape put this Chicago MC on the hip-hop radar.