Often referred to as “Europe’s #1 Rock Show,” Countdown was on-the-air for 16 years (1977-1993), and was broadcast in 18 countries, making it one of the most successful music shows in the history of television.

Darren Criss transforms Britney Spears' "Toxic" by singing the song in several different genres, including '70s Soul, Heavy Metal, Bluegrass and more in One Song, Many Genres.

This list is bound to bring back some memories. Familiar songs you may still listen to and others you may have forgotten.