I was thinking unpretentious or unassuming, but they don’t quite capture the sentiment that I want to convey regarding this type of performance. Low-key works sort of in a slang way, but I know there is a more satisfactory word out there but I can’t remember it for the life of me.
Link of performance: https://youtu.be/bsYp9q3QNaQ
I’m referring to the way he performs and how he presents himself (the suit, lack of movement, etc.) while still delivering an amazing performance.