After learning iHeartMedia's recent St. Jude Radiothon on 1 December (16) raised more than $1.3 million (GBP1 million) for the hospital, generous Garth pledged to donate $20 (GBP16) from the sale of every copy sold of his Ultimate Box Collection between the start of the month and Christmas Day.

"I was stunned when I heard just how much money the show had raised in one day,” Brooks says in a press release. “It really motivated me to get involved and see how I could try and help such an amazing cause."

Garth Brooks: The Ultimate Collection is available exclusively at Target stores across the U.S. and includes 10 discs featuring the country superstar's most famous songs, in addition to 18 previously unreleased tracks.