Thrillers typically feature diegetic sounds like gunshots and screams to build tension. The music often starts slowly and speeds up throughout tracks. Common musical techniques include using low, deep sounds or high pitches that get progressively louder or deeper as scenes intensify. For example, Psycho features repetitive noises that crescendo during the murder bath scene. Successful thrillers contrast screams with deeper background music, and often employ a slow tempo with escalating high pitches to foreshadow tension and unpredictability.