Legendary singer-songwriter Cat Stevens , also known as Yusuf, announced that his upcoming North American book tour will be postponed due to unspecified visa issues.

The "Morning Has Broken" singer took to Instagram to share the news on Monday, saying his "Cat on the Road to Findout" book tour won't be going ahead as scheduled next month. The book will be released in the U.S. on Oct. 7 and was made available in the U.K. earlier this month.

"Waiting months for visa approvals, we held out as long as we could," he wrote. "However, at this point, the production logistics necessary for my show cannot be arranged in time."

He added: "I am really upset! Not least for my fans who have bought tickets and made travel plans to see me perform."

Yusuf Islam, also known as Cat Stevens, perfor

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