Who the heck are 5 Seconds of Summer?

Punk comes is all different shapes and sizes. Pop-punk in particular has evolved from Blink-182 to Green Day to Fall Out Boy to All Time Low and now pop-punk is going a little more pop than punk. This week, Australian quartet 5 Seconds of Summer announced a massive headlining North American tour a year in advance on the same day their album debuted at number one on the Billboard charts. They are by far the poppiest punk band to hit the radio.

Never heard of them? Whether you decide to welcome the band or not, you should make an informed decision. Gimme Noise has the 411 on the One Direction of pop-punk.

See also: One Direction's 1D World at Mall of America is a nostalgia presale

Members: Luke Hemmings (17-years-old) - lead vocals and guitar Michael Clifford (18-years-old) - guitar Calum Hood (18-years-old) - bass guitar Ashton Irwin (19-years-old) - drums

Hometown: Sydney, Australia.

Similar to: All Time Low, We The Kings, Yellowcard, The Summer Set.

The story: 5SOS formed in 2011 and grew their fanbase by posting videos of cover of songs from various artists such as A Day to Remember, All Time Low, Mayday Parade, and We the Kings, which they said are their influences. You can see and hear these pop punk influences in their music. They became YouTube stars, which is how they gained their following. They currently have nearly two million Instagrammers following them, four million followers on Twitter, and over six million Facebook likes.

Once One Direction took them on their Take me Home Tour in 2012, they became more known and their fanbase grew immensely. After signing to Capitol Records last year, there has been word they are looking to start their own label, which would partner off Capitol Records, to make all creative decisions. Within three years this band had success thrown at them quickly and are already headlining their own arena tour.

See also: Review: One Direction at Target Center

Next: What do they sound like? [page]

The music: Their debut single "She Looks So Perfect" is getting radio play and has racked up over 58 million views on YouTube. Their self-titled debut album hit number 1 on the Billboard 200 and is a summer album. It's full of catchy lyrics and danceable melodies, much like All Time Low's Dirty Work. They aren't near the high quality lyrics brought by Fall Out Boy, but have the potential to get there.

Opting to work with Boys Like Girls' Martin Johnson, Yellowcard's Ryan Key, ATL's Alex Gaskarth, and Goldfinger's John Feldmann gives them more credibility and pushes them more into pop-punk than the boy band genre. The main reason why 5SOS is considered more punk is because they are behind real instruments and aren't on stage moving about in choreographed dances. They are making huge strides in both the pop-punk world and the boy band world. Look out, Hot Topic!

Pop-punk has waned on radio since Fall Out Boy and Paramore started in the early 2000s. It never actually left, but the emergence of 5SOS suggests it's working its way into the mainstream. Could these four Australian musicians just be another boy band? Their fans are the same tween One Direction fans but they were pop-punk first. Still, they have just the right amount of punk and boy band to make them irresistible to some -- and caustic to others.

Whether you're a boy band fan, a pop-punk fan or both, 5SOS are gonna be your. If they don't, that's cool too but don't expect them to go anywhere. This is only the beginning of the 5SOS hype.

5 Seconds Of Summer, $29.50 - $69.50, Friday, July 31 at the Xcel Energy Center. Tickets on sale Saturday, August 9 at 10 am via Ticketmaster.

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