Ground Up while walking down a flight of stairs to catch the MTA. Not literally, you know, but visually. The hallway to my stop was lined with stickers bearing a haunting photograph of a weathered angel statue; cover art for excellent mixtape the Philly hip-hop trio had just dropped, The Get Up. Being so focused on the Philly scene, you get used to thinking about musicians in a purely local context, and this sticker gallery was a great reminder that for many of the musicians near and dear to home, their impact is much broader. The train is moving fast for Ground Up – the trio of MCs Azar and Malakai, with producer Bij Lincs. The Get Up was their ninth release in the past two years, and they’re getting ready to come out with their tenth – Supernatural, out on September 18th. They’re also not afraid of outside-the-box collaboration, since their free concert in Rittenhouse Square for Philadelphia Weekly’s Concerts in the Park series will reportedly feature alt-country combo The Lawsuits (old buddies of the band) as their backing band. Below, dig into a couple tracks the DJ-and-MC edition of Ground Up recorded for the Key Studio Sessions. Tonight, get a taste of Ground Up gone rock; the show begins at 17th and Walnut at 7 p.m.