The Black Sabbath reunion is in jeopardy once again, as drummer Bill Ward has threatened to pull out of the band if he doesn't get a more favorable contract. Sabbath's much-hyped reunion, announced last fall, already faced a setback with the announcement that guitarist Tony Iommi has been diagnosed with lymphoma.

Ward has released a lengthy statement addressed to "Sabbath Fans, Fellow Musicians and Interested Parties." In the letter, which can be read here via Rolling Stone, Ward writes, "At this time, I would love nothing more than to be able to proceed with the Black Sabbath album and tour. However, I am unable to continue unless a 'signable' contract is drawn up; a contract that reflects some dignity and respect toward me as an original member of the band."

Ward adds that he feels "ostracized" from the Sabbath recording sessions, currently taking place in the UK to accommodate Iommi's health.

Rolling Stone notes that Ward has clashed with Sabath's management in the past. In 2004, he was almost replaced on the Ozzfest tour by Mike Bordin of Faith No More and backed out of playing as part of Heaven And Hell with the late Ronnie James Dio and his fellow Sabbath members in 2006.