We've reached the second round in Ultimate Classic Rock's Greatest Summer Song battle, and it's time for two British bands to duke it out: Led Zeppelin's "Dancing Days" takes on the Kinks' "Sunny Afternoon."

After starting with 32 of classic rock’s best summertime songs last week, we're now down to 16 for the second round. Over the next four weeks the field will be repeatedly cut in half by your votes until we arrive at the greatest summer song ever made.

Led Zeppelin handily beat Seals and Crofts, who were checking in with their summer classic "Summer Breeze," in round-one voting. The classic rock kings strolled away with almost 63 percent of the vote. But the Kinks had a small battle on their hands, with the Lovin' Spoonful's "Summer in the City" giving them a fight. But the British band walked away with the win, snagging 56 percent of the vote.

"Dancing Days" first appeared on 1973's Houses of the Holy, and, as far as we can tell, it's all about one of Zeppelin's favorite subjects: sex. In this case, it's some summertime sex. "Sunny Afternoon," however, is a bit deceitful with its cheery melody, which disguises just how down in the dumps the dude at the center of the song really is. His girl left him, she took his car and he's broke as hell. Still, he's got the sun's rays kissing him from afar. So maybe things aren't so bad after all.

So which song will make it through to the semifinals? That's where you come in. We've embedded both songs below so that you can make an informed decision. You can vote once per hour in each of the eight second-round Greatest Summer Song battles until voting closes on Aug. 3 at 11:59PM ET. Your choice for the Greatest Summer Song of all time will be revealed on Aug. 25, 2015.

Listen to Led Zeppelin's 'Dancing Days’

Listen to the Kinks' 'Sunny Afternoon’

See Led Zeppelin and Other Rockers in the Top 100 Albums of the '70s