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DENVER - Organizers of a Colorado fundraiser say country music legend Willie Nelson cancelled a weekend appearance after a health scare.

The 79-year-old Nelson was scheduled to perform Saturday at a private home in Castle Pines Village, Colo. The benefit was for an organization that provides animal care and shelter in the Denver area.

The host of the fundraiser, Fred Bartlit, tells The Denver Post that he was informed that Nelson was taken to the hospital after having trouble breathing.

An announcement to the concert crowd said Nelson suffered "from breathing problems due to the high altitude and emphysema" and taken to a nearby hospital.

Representatives for Nelson couldn't immediately be reached for comment Sunday night.

Back in July, Nelson talked exclusively one-one-one with the NBC affiliate in Dallas-Fort Worth as he prepared for his annual Fourth of July picnic at Billy Bob's in the Fort Worth Stockyards.

Nelson told NBC 5's Scott Gordon he probably will never retire.

"I still enjoy coming out and playing music and as long as the people enjoy it and come see us, I see no reason to quit," Nelson said.

Nelson is scheduled to perform at the House of Blues in Dallas on Tuesday. No word on if he will be physically able to honor that commitment.