Since forming in 2005, Mayday Parade have amassed one of the most loyal, rabid fan bases around thanks to energizing concerts and four studio albums full of heart-on-sleeve lyrics. With the release of their arresting fifth record, the Mike Sapone-produced ‘Black Lines,’ the members of the Florida pop-rock quintet — vocalist Derek Sanders, guitarists Brooks Betts and Alex Garcia, bassist Jeremy Lenzo and drummer Jake Bundrick — are taking a giant leap forward as musicians and songwriters. “It’s time to switch things up a little bit,” Sanders says. That’s evident from ‘Black Lines” ferocious opening song, “One Of Them Will Destroy The Other,” which features slashing guitars, throat-shredding vocals and a guest appearance from Real Friends’ Dan Lambton. The sizzling, grungy “Hollow” and the tornadic, teeth-baring “Let’s Be Honest” also boast aggressive riffs and a propulsive rhythmic backbone. “We noticed some of the songs were heavier than we’ve ever done, that there were a lot of guitar riffs we had never really had before,” Bundrick says. “We tried to make those parts more distinct.” Yet like other Mayday Parade albums, ‘Black Lines’ is certainly dynamic — for example, the tension-filled, simmering choruses on “Underneath The Tide” explode into soaring, noisy verses — and has undeniable variety: “Just Out Of Reach” ends with a plaintive piano coda and lonely vocals, while the ’90s alt-rock-reminiscent “Letting Go” is driven by rich acoustic guitar and Sanders’ delicate singing. Long-time fans shouldn’t worry, however: Mayday Parade’s core creative process, which is steeped in collaboration and democratic decision-making, remains firmly intact. “We all bring in ideas, and they could change drastically once everybody puts in their input,” Sanders says. “It wouldn’t be a Mayday Parade record if we didn’t all five work on the songs together like that.” In fact, ‘Black Lines’ was even more of a group effort — which is not only a representation of how each band member has improved musically, but also an indication of their innate, ever-evolving chemistry. Ten years into their career, the members of Mayday Parade are more creatively charged than ever.