I have a T2 and use the Concert Guitar sound all the time. I knew he was playing it all by himself with no styles.

My comment was for him to change things up for what he was playing solo. I thought his left hand (arpegiated chords) was nice to start but given the length of the piece he needed some variety as the song went on. As example, he could have used some rolled chords, played some melody without chords, or used a left-hand comp such as play and hold bottom note of the chord and play top two notes of the chord in a rhythm. These would all have been possible variations without changing the sound.