* Guitar: Katy Perry also plays the guitar in the music video for "Roar."
* Bass: Katy Perry does not play the bass in the music video for "Roar," but a bass player is present.
* Keyboard: Katy Perry does not play the keyboard in the music video for "Roar," but a keyboardist is present.
* Other instruments: In addition to the drums, guitar, bass, and keyboard, there are other instruments present in the music video for "Roar," such as a flute, trumpet, and trombone.