United Kingdom, May 21 -- ABBA are mourning the loss of their former sound engineer Michael B Tretow.

The music industry veteran's death was announced on Tuesday (20.05.25) and now the stars of ABBA have all released statements paying tribute to their pal, who worked with them as a sound engineer in the 1970s before becoming a producer, with bandmember Benny Andersson crediting Michael with making their music sound "timeless".

Benny said in a statement: "You meant more to us four in ABBA than anyone else. I hope and believe that you felt it throughout all the years that have passed since we worked (and continuously laughed) in the studio.

"Our music lives on, it seems, and you are the one who made it timeless. You were a fantastic insp...