Willie Nelson canceled the remainder of his tour because of health concerns, which have caused him to have issues with breathing.

The legendary country singer took to Twitter to apologize to fans.

The singer was set to perform at the Farm Aid concert with John Mellencamp, Dave Matthews, Neil Young and Bonnie Raitt on Sept. 21.

Willie had also canceled an appearance at the Outlaw Music Festival due to illness last summer. Get better, Willie!