Mood: The mood of the video appears to be celebratory and nostalgic, likely a collection of popular songs by Tulsi Kumar to commemorate her birthday. The theme seems to be a musical tribute, given the presence of a microphone and a jukebox logo.

Environment: The setting seems to be a darkened studio or performance space with subtle lighting effects, suggested by the dark background with red bokeh lights. The overall ambiance is intimate and performance-oriented, likely reflecting a music-related setting.