 Enforcing the theme and the narrative are the use of sound effects, such as a door creaking or a pendulum swinging on the Poe-inspired "Shadow of the Raven".Their trilogy of winter holiday-themed albums feature a range of ethereal-style choirs, Gregorian-style chanting, classical music, and Celtic new-age instrumentation, giving a darker overtone to music for the Christmas and Yuletide holidays.Their third release,"Winter's Knight" peaked at #8 on the "Billboard" chart for Top Holiday Album in 2006 and again in 2007.