In a battle of two titans of British rock, Led Zeppelin's 'Whole Lotta Love' faces off against the Kinks' 'You Really Got Me' in round two of Ultimate Classic Rock's March Riff Madness.

Last week, we cut down the initial field of 32 of rock's most iconic riffs down to 16. And this week we'll halve it again, then repeat the process for the rest of the month until we theoretically arrive at the most awesome riff in all of rock history.

The competitors arrived at the second round differently. 'Whole Lotta Love' breezed past the Who's 'I Can't Explain' by a massive margin in round one. Meanwhile, 'You Really Got Me' pulled out a squeaker against AC/DC's similarly monolithic 'Back in Black.'

So which riff gets the nod -- or headbang, if you will -- this week? You can vote once per hour until round two of March Riff Madness closes on Sunday, March 16 at 11:59PM ET. The ultimate March Riff Madness winner will be revealed on Tuesday, April 7.

Watch Led Zeppelin Perform 'Whole Lotta Love'

Watch the Kinks Perform 'You Really Got Me'