In early 2013, Fall Out Boy exploded back into musical relevancy with their hit single, "My Songs Know What You Did in the Dark (Light 'Em Up)," followed closely by their fifth studio album, Save Rock and Roll. Since then, the band has toured extensively, released their sixth album, American Beauty/American Psycho (featuring their hit single "Centuries") and picked up quite a few new fans. Unfortunately, many of these newcomers are, for the most part, woefully ignorant of the band's amazing pre-hiatus work. As for us older fans, we can look back fondly on the good old days and see how Fall Out Boy has grown over the years. With all of that in mind, here are a few reasons to go back and (re)discover what you've been missing.

1. Save Rock and Roll will make so much more sense.

So much of FOB's comeback album focuses on the ideas of rebirth and growing up ("The Phoenix," in particular). Their earlier albums are a necessary prologue – From Under the Cork Tree and Infinity on High deal with the band's rise to fame, while Folie a Deux elaborates on the band's struggles with stardom; struggles that ultimately led to the band's hiatus.

2. Pete's Lyrics. Woah.

Pete Wentz, the bassist and lyricist for the band, has always had a knack for creative one-liners, whether they be lyrics or song titles. Nowhere does he better demonstrate that gift than on the band's earlier albums.

3. The emo phase is really cute in retrospect (I promise).

Take This To Your Grave, the band's first album, is in many ways a stereotypical early 2000's emo album, complete with songs about the band's hometown and friends, lyrics confessing guilt and shame over certain romances ("Hey Chris, you were our only friend, and I know this is belated, but we love you back"; "I want to hate you half as much as I hate myself"). Despite all the angst, it's a great album that exemplifies both the genre FOB came from and how it was more than just another emo band.

4. You'll understand a couple of references.

Specifically, at the beginning of Save Rock and Roll, when there's a high-pitched voice saying "Until your breathing stops forever." That's a line from "Chicago is So Two Years Ago," a track off the band's first album. You're welcome.

5. It's almost like a different band.

Fall Out Boy's post-hiatus sound is hard to describe. Their pre-hiatus sound, however, is more or less pop-punk. If you didn't recognize Pat's voice, you'd never know the same band wrote "Saturday" and "Alone Together."

6. Each album has a unique sound.

Just like pre and post-hiatus FOB sound totally different, each of the band's first four albums are quite distinct. Take This To Your Grave is a classic emo album. From Under the Cork Tree is a weird hybrid of emo and pop-punk. Infinity on High is pop-rock. Folie a Deux is, well, no one was ever sure exactly what that one was, so people just called it "ambitious."

7. You can hear the songs that made them famous.

"My Songs Know What You Did in the Dark (Light 'Em Up)" and "Centuries" are huge hits, but no one would know about Fall Out Boy if not for its early successes. Without "Grand Theft Autumn/Where is Your Boy," "Dance Dance," "Sugar, We're Going Down," "This Ain't A Scene, It's an Arms Race," and "Thnks fr th Mmrs," Fall Out Boy wouldn't have been around long enough to write their newest hits.

8. The evolution of Pat's voice.

Sensing a trend? Pat Stump, the lead singer, sounds so different with each album. First he's very nasally, then he spends the entire second album belting, and he blends the two on the band's third and fourth albums for an excellent sound. I imagine you learn a few things after singing in a band for over 10 years.

9. The music videos.

Fall Out Boy's old musics videos were fantastic. Who could ever forget the war in the streets against vampires in "A Little Less 16 Candles, a Little More 'Touch Me,' " or the kid with the antlers in "Sugar, We're Going Down"? Oh, and then there's "The Carpal Tunnel of Love," featuring Happy Tree Friends.

10. Why not?

If you call yourself a Fall Out Boy fan, you should make a point of knowing all of the band's work, not just their recent albums. And if you're just a casual enjoyer of the band's recent hits, then it could still be worth going back and exploring their old songs. Who knows, you might realize you love pop-punk.