This document analyzes the music and editing techniques used in the horror trailer "Dolly". It notes that the music starts slow and high pitched to set a creepy tone, then builds tension throughout with deeper layers of instruments and sound effects like heartbeats. The music speeds up towards the end of the trailer as horror conventions dictate. Camera angles like close-ups on the doll are used to show its importance over the innocent young girl. Shots alternate quickly between clips to increase the pace as the dramatic music repeats at the end.