Here’s a band that came out of nowhere, quite literally. The El Mansouris, composed of Alex Braden, Drew Hagelin, Fiona Kohrman, Margot MacDonald and Sam Raymond, just started their social media accounts in mid January and made a lasting first impression with their NPR Tiny Desk contest entry, this live version of “Walden” with lots of great drumming. Get in on the ground floor and keep your eyes peeled for their debut show soon.