Simplify the following text for a Grade 6 native English-speaking person.
Original: William Patrick `` Billy '' Corgan , Jr. ( born March 17 , 1967 ) is an American singer , songwriter , guitarist and occasional poet best known as the frontman and sole permanent member of The Smashing Pumpkins .
Simplified: William Patrick `` Billy '' Corgan , Jr. ( born March 17 , 1967 ) is the singer and guitarist play for the American band The Smashing Pumpkins .