Eales was born in
Aberbargoed, Wales. When he was eight years old, he learned
12-bar blues from his father, a pianist in a local dance band. In school he studied classical piano and French Horn, becoming a member of the Glamorgan Youth Orchestra and the
National Youth Orchestra of Wales. He attended
Cardiff University, receiving bachelor's, masters, and doctoral degrees. In 1980 he was awarded a
Ph.D. for his large scale orchestral work "An American Symphony" and a setting of
Dylan Thomas' poem "In the Beginning" for tenor, French horn, and piano. His thesis was entitled
"Structure in the Symphonic Works of Aaron Copland". ==Career==