It's a land vs. sea battle as Heart's 'Barracuda' takes on Guns N' Roses' 'Welcome to the Jungle' in round two of Ultimate Classic Rock's March Riff Madness.

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

Guns N' Roses reached this round by defeating Montrose's hard, sweet and sticky 'Rock Candy' very easily in week one. Meanwhile, Heart's sharp teeth ripped right through the mighty Van Halen for a narrow but clear victory over 'Unchained.'

So who gets your vote this time? You can weigh in 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 Guns N' Roses Perform 'Welcome to the Jungle'

Watch Heart Perform 'Barracuda'