Mood: The mood of the video appears to be youthful and playful, with a hint of edginess. The theme seems to revolve around music and possibly friendship or camaraderie, given the title 'Gang of Littles'. The overall emotion conveyed is upbeat and carefree.

Environment: The setting of the video seems to be outdoors, possibly during the daytime, given the bright and sunny background. The focus is on the young individual with the guitar, suggesting that the video might be shot in a casual, informal setting such as a park or a street.