Yellow Ostrich -- Fri., 1:30 p.m. Since 2009, Alex Schaaf has made lo-fi pop under the moniker Yellow Ostrich -- first with a series of self-releases posted to Bandcamp, later in a studio to create his debut full-length, Strange Land. Released in March via Barsuk, each song plays out like a diary entry: "I don’t know if we’re still friends/I don’t know if you’re happy/but I will love you till the end/'cause I’ll still love  you badly," he sings on "I Want Yr Love." It's subtle, with carefully placed instrumentation by his backing band, layered and looped, introspective and idiosyncratic -- the sort of solo pop that shines through its oddities.

Chief Keef -- Sat, 12:15 p.m. Earlier this month, during the final sets of Pitchfork Music Festival, Arabmuzik was impressing with his rapidfire MPC drumming and out-there live beats, when Chief Keef -- a 16-year-old Chicago rapper with a recent major-label deal -- made a surprise appearance on stage for two songs, bringing his massive crew with him: an undeniable highlight of the weekend. Keef is one of the biggest names in Chicago hip-hop at the moment, but has performed few hometown shows, so his Lolla set is definitely one to catch.

Fidlar -- Sat, 1:00 p.m. This spring at SXSW, I saw Fidlar tear down the tail-end of WNYU's showcase in a makeshift show space -- the parking lot of Baby Blue Recording Studios in East Austin. Their set was attended by a group of dedicated super-fans who flailed around and screamed along to every word -- a solid indication of the sorts of rowdy shows these teen punks are known to put on. Fidlar hate rules, love parties.

JEFF The Brotherhood -- Sat, 1:30pm JEFF the Brotherhood have been touring relentlessly for years, making a reputation for themselves as one of the best rock shows around. The Nashville brothers duo -- who also run their label, Infinity Cat, out of their hometown -- have been playing their garage rock jams since 2001, when they were still in high school. Before landing on mega-fests like Lolla, they spent years playing sweaty makeshift illegal show spots and basement ragers and self-booked tours with DIY purists like Screaming Females. Now on their seventh studio album -- and first for a major label -- they're touring this summer with Hypnotic Nights, produced by the Black Keys' Dan Auerbach. It's their poppiest yet, but still full of head-banging garage rock: good-time anthems that are at once heavy and hooky.

Oberhofer -- Sun., 1:00 p.m. When I first saw 19-year-old named Brad Oberhofer (a/k/a Oberhofer) play at a tiny, totally packed-out Brooklyn bar during the last night of CMJ 2010, I knew dude was onto something, with his hook-heavy pop jams and the catchiest of "oOh-oOh-oOh"s, backed by a 3-piece band. Most notable though were Oberhofer's emotional vocals, belting out coming-of-age lyrics about young love and loss. Over the next year, he was asked to tour with Neon Indian, the Morning Benders, Sleigh Bells, and eventually by 2012, he had released Time Capsules II with a big-name label, Glassnote. The record plays out with the same youthful energy; it's all wide-eyed piano pop, songs about falling in love in the wrong place at the wrong time, dealing with naiveté, learning to be alone; guitar-oriented tracks accented by glock, strings, piano. "All these songs are time capsules," he told Stereogum earlier this year. "They all are representative of specific moments in time. Some of them were sad moments. Some were great. Some were a little bit bittersweet. I’ve sort of come to the decision that all my memories, whether sad in the moment or ecstatic in the moment are fond memories and I look back at these songs as just all proud moments and I have tried to bring those moments into the present." It sounds like he's totally crushed but simultaneously celebrating. And produced by Steve Lilywhite, it also sounds totally made for festivals.

Poliça -- Sun, 1:30 p.m. Minneapolis pop act Polica have existed less than a year, comprised of Ryan Olson and Channy Leaneagh, former collaborators with GAYNGS. Incorporating bits of R&B, psychedelia, and electronic pop, their 2011 debut LP, Give You The Ghost, contained 11 tracks of finely auto-tuned vocals, sitting in an avant-pop sweet spot between dark and dreamy. They’re one of the best acts on this year’s Lollapalooza -- if you don’t trust us, take it from Bon Iver, who has called them his favorite band in interviews.