Last week, Chief Keef was released from the Illinois Youth Center, where he was serving a 60-day sentence for violating his probation. In the video of his release, his Glory Boyz comrades looked really excited to have their leader back. But even though Keef's output has obviously stalled in the last two months, GBE stars Lil Reese, SD, Lil Durk, and Fredo Santana have stayed busy, dropping new singles and mixtapes to keep drill music fanatics satiated in Sosa's absence.

In a retrospective listening of the young crew's best songs, it's honestly hard to distinguish one track from the next, because the framework remains so consistent - woozy, menacing loops of keyboard or synth clinks over monstrous, rapid-fire drums. The subject matter does too, seldom straying from smoking blunts, having money, gang banging, and surprisingly, a preference for oral sex to actual sex. They've also (with help from frequent videographer D. Gainz) perfected the art of the day-in-the-life music video, most of which show the Glory Boyz rapping, holding guns, and rolling blunts. Oh, to be young.

Not all of GBE's many songs are great, but a lot of things about the crew are - including their name, which is second only to Fat Trel's Slutty Boyz squad. What's most impressive about the crew, though, is their output (a combined 15 solo mixtapes released over the past two years) and the fact that each member has a burgeoning solo career. Unlike crews like the St. Lunatics or the original GOOD Music family (what's up, Really Doe?), each of the GBE boys has a significant following.

As Chief Keef preps his anticipated Bang, Pt. 2 mixtape and the rest of the crew works on their solo debuts, click through to familiarize yourself with GBE's best tracks to date. - Compiled by Dan Buyanovsky. Additional reporting by Sean Ryon, Jaeki Cho, and Eric Diep.

(images courtesy of Daniel Shea via The Fader)

Chief Keef ft. Lil Reese - "I Don't Like"

The song that brought GBE to the limelight, eventually inspiring Kanye to remix it and add it to his GOOD Music compilation album. The song's video has over 25 million views to date, and features the extended crew vibing out in an empty house and introduces viewers to the mosh-pitting, dread-swinging 3Hunna lifestyle. This is modern Midwest punk rock.

Chief Keef ft. Soulja Boy - "3Hunna"

The magnum opus of the GBE movement. Keef clarifies his hunna-level with the line, "You keep this shit 1Hunna, I keep this shit 3Hunna." 'Nuff said.

Chief Keef & Riff Raff - "Cuz My Gear"

Rap game King Tut and internet fame opportunist Riff Raff was one of the first people to cosign Keef with a collab called "Cuz My Gear" and shot a video for it in a motel room, which is pretty much exactly what he did with Kitty Pryde.

Fredo Santana ft. Gino Marley - "My Plug"

This standout from It's a Scary Site is produced by someone named 12 Hunna - which is 4 times 3Hunna - which is really just a lot of Hunna. So you know it's good.

SD - "Turn Up"

Even though Juicy J is the international ambassador for the TURN UP lifestyle, when SD gutturally shouts about being turn't up by the money, I feel like he's doing the thizzle dance and mobbing in the street, not sitting on a quiet music video set with Big Sean. It's all about context.

Chief Keef - "Love Sosa"

A few days after Keef dropped this new single from Finally Rich, rap's Canadian statesman Drake tweeted, "Love Sosa has at least 130 plays in the last 3 days," providing Chief with an invaluable nod of approval. This is the song older rap dudes jam to when they think about the glory days.

SD ft. John Boy - "If She Ain't Fuckin"

SD teams up with one of Soulja Boy's SODMG team members for this as-direct-as-you-can-get banger, on which John Boy boldly promises, "if you ain't fuckin' the team, you ain't comin' around." Any takers?

Lil Durk & Fredo Santana - "Wild Niggas"

Fredo's grimy enunciation sets this song off and gives Durk - who sounds the tamest and most monotonous of the bunch - some room to dive in and rapid-fire spit about how wild he really is.

Chief Keef ft. Soulja Boy – “Foreign Cars”

The newcomer and the original mush-mouth rap titan connect on Keef and Soulja Boy’s “Foreign Cars,” which is an ode to – you guessed it - foreign cars. Always down to rep the struggle is Soulja Boy, who’s barely able keep in time with the beat while donning a bootleg-Future robot voice.

Lil Reese "Us"

Reese looks the most like a born star of anyone in the GBE crew and is also the least comfortable in front of the camera - looking down and around for the majority of the video - but his swaggy confidence carries this anthem.

Also: Rick Ross ft. Drake and Lil Reese - "Us Remix"

For his late-2012 mixtape, The Black Bar Mitzvah, Rick Ross invited Drizzy to rap over the Reese single, but both of the pop stars sound a bit lot too old to be making drill music.

Lil Durk - "L's Anthem"

Durk's first solo single after his Def Jam deal is about as perfect as a crossover hit for a drill rapper can get. The production sounds bigger, more anthemic (get it?) and he filters his melodic raps through Auto-Tune to be the make this the most accessible song in the GBE discography.

Fredo Santana ft. Juelz Santana - "This Rollie On My Wrist"

The Santanas connect! Juelz pops up on this track, which sounds like a crazy idea… but he fits right in with Fredo, who's probably about half his age. Still, he slows down his Harlem flow to properly ride this drill beat and makes it work.

Fredo Santana ft. Future, SD, and Chief Keef - "Dead Broke"

With an upside-down cross tattoo between his eyes, Fredo Santana might be the most menacing of the GBE gang. For the final track off his Fredo Kruger mixtape, Mike WiLL provides Fredo with his unique brand of creepy club music. The A's legendary hook-king Future comes through with a spookily-sung chorus to bring it all together.

Lil Reese ft. Chief Keef - "Traffic"

This is probably the highest-quality GBE video, and also features the most women in the background. Also, Twista shows up for some grill-flashing. Reese raps in Keef's ear like a protective older brother, and Keef seems excited to be riding shotgun in a Jag and hilariously raps, "That bitch gon' give me neck, like a Dracula."

SD - "We Wassup"

SD isn't the biggest name in the GBE crew, but just like his cohorts he can definitely hold his own on a Young Chop beat. On “We Wassup," the pre-neck-tattoo'd SD belligerently raps about his distrust of women from the back of a truck and from the driver's seat of a black sedan. This is versatility.

Lil Durk - "Right Here"

This song became so hot in the streets that Meek Mill jumped on the remix, and is a perfect complement of street rhymes and Durk's (post dreads) melodic crooning. On the Young Chop-produced track, he explains his loyalty to his OTF crew, while occasionally shouting out, “let’s get it!” It’s a definitive statement from someone aiming for the top.

Chief Keef ft. Fat Trel - "Russian Roullette"

Slutty and Glory worlds collide on Keef and Trel's debut collaboration. The duo look like distant cousins but play off one another like old friends over this Lex Luger street hit. A close listen of this one would make you think these guys' friends are a suicidal bunch, but we doubt that's what they mean.

Fredo Santana - “Gang Bang”

Don’t be scared, America! Fredo Santana is just young, getting it, waving imaginary (or hidden) heaters, and chilling at the local bodega with his cronies. Much more one-dimensional than materials churned out by West Coast OGs, but certainly gets the gangbanging points across and ignites a brain-cell-drilling singalong.

Chief Keef - "I Don't Know Dem"

Chief Keef employs a fairly xenophobic foreign policy to unfamiliar entities encroaching on his Chicago territory with this January 2012 cut. That, or he's got some serious social anxiety issues, 'cause a "pistol to his face" is never the best way to make new friends.

Fredo Santana ft. Chief Keef & Lil Reese - "My Lil' Niggas"

Who said that Fredo Santana isn't for the kids? The eldest member of the GBE squad links with Keef and Reese for a drill masterpiece, complete with Keef ghost riding on the side of what looks like a late-80s Ford Econoline. Who needs a rooster in your Rari when you squad up in the comfort of an Econoline, bruh?

Chief Keef - “Kobe”

Chief Keef’s a master orator of delivering simple messages in an even simpler manner, and through recitation he turns them into manifestos. He’s young and he's rich, so he feels like he’s Kobe. Brilliant. Jimmy Iovine signed him, Keef’s rich now, and he’s delivering his arrival so easily without much intended effort. Try doing that with a jam-packed lyrical-miracle 16. Keef’s winning. And so are the rest of the Glory Boyz.