Aerosmith's 'Walk This Way' faces off against Joe Walsh's 'Rocky Mountain Way' in round two of Ultimate Classic Rock's March Riff Madness.

32 of classic rock’s most iconic riffs were cut down to a field of 16 by your votes last week. We'll repeat this process four more times over the next month until we theoretically arrive at the most awesome riff in all of rock history.

'Walk This Way,' from Aerosmith's 1975 classic 'Toys in the Attic,' earned their place in round two by handily scaling Mountain's mighty 'Mississippi Queen' in round one. Walsh's 'Rocky Mountain Way' -- from 1973's 'The Smoker You Drink, the Player You Get' -- defeated the Kiss stomper 'God of Thunder' just as easily.

So which (forgive us) "way" will the voting go in this battle? It's up to you! Everyone 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 Aerosmith Perform 'Walk This Way'

Watch Joe Walsh Perform 'Rocky Mountain Way'