Sgt.Popgrass sings Beatle Classics along side Sgt. Popgrass originals. Sgt. Popgrass is the brain child of Graham Elvis. He has created a genre of music that is energetic, unique and original by combining modern classic-pop songwriting with a bluegrassy-ish instrumentation.. It should be mentioned that Sgt.Pograss performs dozens of fresh and engaging Beatle songs live, sending smiles to everyone. Don't wait to be drafted in the Popgrass army, enlist today.