Mood: The mood of the video appears to be lively and celebratory, with a sense of excitement and energy. The theme seems to be a musical celebration, possibly a compilation of popular Bollywood songs, given the title 'World Music Day 2021'. The emotions conveyed are upbeat and joyful, with a hint of glamour and showbiz.

Environment: The setting appears to be a dark or night-time environment, possibly a concert or a music festival, given the theme of World Music Day. The background is dark with purple and pink lights, suggesting a vibrant and lively atmosphere. The presence of multiple individuals, possibly celebrities or musicians, adds to the sense of a grand musical event.