Imagine Dragons' "Natural" (Interscope) comfortably remains at #1 for a third week. AJR's "Burn The House Down" (AJR/S-Curve) holds at #2. Marshmello's "Happier" f/Bastille (Capitol) rises to #13, up 300 spins. Barns Courtney's "99" (Capitol) and Robert DeLong's "Revolutionary" (Glassnote) will make their chart debuts.