Simplify the following text for a Grade 8 native English-speaking person.
Original: The band has consisted of Aaron Cometbus ( drums , lyrics ) , Bill Schneider ( bass ) , Billie Joe Armstrong ( guitar , vocals ) and Jason White ( guitar , vocals ) for the majority of its existence .
Simplified: Its members are Billie Joe Armstrong ( singer and guitarist of Green Day ) , Aaron Cometbus , Bill Schneider and Jason White .