The Whites took to social media to pay respects to Barry Mason, the man who co-wrote the legendary anthem that powers Marcelo Bielsa's men forwards every matchday.
A spokesman for Leeds United said: "#LUFC are saddened to learn of the passing of Barry Mason, co-writer of the club's anthem Marching On Together.
"Our thoughts are with his family and friends. #RIPBarry"
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But Barry Mason, MBE, isn't just known for Marching On Together.
The songwriter's creations have been recorded by the likes of Tom Jones, Rod Steward, Tony Christie, Barbra Streisand and Elvis Presley.
He was appointed Member of the Order of the British Empire (MBE) in the 2020 Birthday Honours for services to music.
Barry died on Friday after a short illness.