The Rundgrens' lawyer, Gary Dubin, said the couple are still in their home and have other defenses to fight the foreclosure.
"This is just the beginning," Dubin said by email.
JPMorgan spokesman Jason Lobo declined comment.
Rundgren, set to begin a U.S. tour in April, is best known for such 1970s hits as "Hello It's Me" and "I Saw the Light."
The Rundgrens' dispute stems from a $3 million refinancing loan the couple arranged with Washington Mutual Bank several months before the bank failed in 2008. Chase bought that bank's assets, including the Rundgrens' loan, out of receivership in 2008.
In court filings, Chase said it started foreclosure proceedings in 2009 after the Rundgrens defaulted on their $17,060 monthly mortgage payments.
The Rundgrens' lawsuit alleged that their mortgage was void because of numerous fraudulent acts by Washington Mutual Bank, also called WaMu, when the bank originated the loan. The lawsuit said WaMu created a false loan application, exaggerated the Rundgrens' income and used a false appraisal for their home.
The lawsuit said WaMu tricked the Rundgrens into signing the mortgage without giving the couple time to read it and understand its terms. The loan had been switched from a fixed-rate to an adjustable-rate loan, the lawsuit said.