This Philadelphia rap duo had been chugging away for years before its studio debut, Breakfast, dropped to moderate success in February. The truth is, you run across the band’s music everywhere — video games, commercials, restaurants — but its interactive live show is where the group built a following. Some would call the Chiddy Bang’s mash-up of hip-hop and indie rock “frat rap,” which the good-life, good-times rhymes support, but there’s some uniqueness to it. In past trips — most recently, as opening act for Diplo’s April surprise show at the Neighborhood Theatre — Chiddy Bang has offered engaging freestyles on all things Queen City, from the Bobcats to NASCAR. It’s that kind of personalization that’s made fans believers that the duo is much more than just a party band.