Rock fans have often been critical of Yoko Ono’s avant-garde vocal stylings, and it seems that some have been getting a good laugh out of a new viral video, where she appears to be singing along to Katy Perry’s “Firework.”

In fact, the performance was originally a cappella, someone added the “Firework” piano chords to the original video.  Watch the original below.

The performance, called “Voice Piece for Soprano & Wish Tree,” was filmed at New York’s Museum Of Modern Art in the summer of 2010.