Mood: The mood of the video appears to be upbeat and energetic, with a theme of showcasing popular Bollywood music from 2015. The collage of images featuring various actors and actresses in different poses suggests a lively and entertaining tone.

Environment: The setting of the video seems to be a music-related environment, possibly a virtual playlist or a music streaming platform. The presence of a jukebox and the text 'Best of 2015' implies a nostalgic and celebratory atmosphere.