Mood: The mood of the video appears to be lively and entertaining, with a theme of music and performance. The use of bright purple lights and the arrangement of the singers' images in a collage suggests a sense of energy and excitement. The overall theme seems to be a celebration of music and singing.

Environment: The environment appears to be a recording studio or a music performance setting, with the singers positioned in front of microphones and some wearing headphones. The background is dark with purple lighting, which suggests a professional recording studio or a live concert setting.