Watch RJ Ronquillo and Colin Scott put an acoustic spin on Santana and AC/DC classics

When Martin first unveiled its offset SC design at NAMM two years ago, the company wanted guitarists to re-think what was possible on an acoustic guitar. 

Featuring a bold cutaway that grants unprecedented upper fret access for an acoustic, the SC line – which was expanded with the unveiling of the SC-10E, SC-13E Special and SC-13E Special Burst in January – was a major new step for the legendary company.

With that in mind, Martin recently launched – in partnership with Guitar World – the No Limits Challenge, an exciting competition where eight up-and-coming guitarists face off against one another, covering tunes one wouldn't normally associate with an acoustic using a Martin SC model. 

For the quarterfinal round, the eight competitors have been split into four genres – funk/R&B, '80s rock, '90s rock and classic rock. The winners in all four categories will advance to a semifinal round, where they'll be divided into two genre-based face-offs. The winners of those, of course, will advance to the finals. 

Who decides the winners, then? That distinction belongs to you, the reader! Take a look at the two performance videos below, and cast your ballot for your favorite in the box at the bottom of the article. It's that simple! 

On tap this week are two phenomenal covers, from Colin Scott and R.J. Ronquillo.

Above, Ronquillo puts his own acoustic spin on the Santana classic, Black Magic Woman, while below, Scott takes on one of the great stadium-rockers of all time, AC/DC's Thunderstruck.

So, which is the better, more exciting cover? That's for you to decide. Be sure to check back next week, too, for the next quarterfinal matchup.