Paul McCartney has penned a heartfelt tribute after he learned of the death of his pal Al Schmitt.
The 78-year-old Beatles star took to social media to express his heartache following the death of 'one of the world's greatest engineers'.
Alongside the touching message, Paul shared a black and white picture in which he appeared deep in conversation with the popular record producer.
"So sad to hear of the passing of my friend Al Schmitt," Paul penned in his tribute.
"Al was the lead engineer in charge of the 'Kisses on the Bottom' session and was a fantastic guy besides being one of the world’s great engineers.
The musician added: "He always had a twinkle in his eye and was ready for a laugh but most importantly when we had done what we thought was a good take and went into the control room to hear the playback it sounded fantastic. His self-effacing skills always came through.
"I send my love to his family and will always remember him with great fondness. Thanks for everything Al. Lots of love, Paul," the Beatles star added.
Al sadly passed away on April 26 at the age of 91.
The well-known recording engineer, who won over 20 Grammy Awards for his contributions to the music industry, leaves behind a legacy of work alongside artists such as Bob Dylan and Elvis Presley. He also produced albums for Jefferson Airplane and Neil Young during his career.
His final two Grammy wins came when he was working with Paul McCartney in 2013.
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Al's family confirmed the sad news on social media, writing: "Al Schmitt’s wife Lisa, his five children, eight grandchildren, and five great grandchildren would like his friends and extended recording industry family to know that he passed away Monday afternoon, April 26.
"The world has lost a much loved and respected extraordinary individual, who led an extraordinary life. The most honored and awarded recording producer/engineer of all time, his parting words at any speaking engagement were, ‘Please be kind to all living things.’
"He was a man who loved deeply, and the friendships, love and admiration he received in return enriched his life and truly mattered to him.
"A light has dimmed in the world, but we all learned so much from him in his time on earth, and are so very grateful to have known him.”
Alongside Paul McCartney's message, tributes have poured in for the engineer-mixer from a host of well known artists including Journey's Steve Perry and Toto's Steve Lukather.
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