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A statement on the band's website had revealed that the drummer had left the group, leaving frontman Billy Corgan as the only remaining original member of the band.
On his website, Chamberlin wrote: "I can no longer commit all of my energy into something that I don't fully possess.
"I won't pretend I'm into something I'm not. I won't do it to myself, you the fan, or my former partner. I can't just 'cash the check', so to speak."
He added: "Music is my life. It is sacred. It deserves the highest commitment at every level and the Pumpkins are certainly no different. I'm sorry but it really IS that simple."
"There is no drama, bad blood, or anything else but a full commitment to music. My best goes out to Billy and I'm glad he has chosen to continue under the name. It is his right."
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