What makes Out Cold by Rockapella notable?

'Out Cold' is significant for its innovative approach to holiday music, contributing to the popularization of a cappella during the early 90s. The album features standout tracks that have become staples in seasonal playlists, reflecting a shift towards vocal-centric arrangements in a time dominated by instrumental arrangements. When Rockapella released 'Out Cold' in 1990, they were gaining momentum as a leading a cappella group, following their breakout on the PBS show 'Where in the World Is Carmen Sandiego?'. This album showcased their unique blend of pop and holiday themes, solidifying their reputation in the genre during this formative period.