Though the format faded in popularity in prime time, it thrived in American late night TV. Night-time variety shows eventually evolved into late-night talk shows, which combine variety entertainment (primarily comedy and live music) with the aspects of a talk show (such as interviews with celebrities). The Emmy Awards academy considers the two genres to be related closely enough that, until 2015, the Primetime Emmy Award for Outstanding Variety, Music or Comedy Series was open to any of these types of show; in 2015, the academy separated late-night talk shows and sketch comedy series into separate categories.