There's so much to keep track of in the busy life of Katy Perry, pop star and T-Swift provocateur. Sometimes it can be hard to remember that before she became the person with the most Twitter followers in the world, she once sang backup vocals for Christian metal band P.O.D. (That's the band who's like "I...feel so aliiiiive...for the very first tiiime..." Remember that? What a grating time in music.)

Here's Perry in the music video for the P.O.D. song "Goodbye For Now," which is currently going viral. (Start around 3:10 for Perry.)

Sources: Entertainment Weekly