Has to be the introduction to one of my biggest pleasures as a small boy before I experienced 'pop' music - the Lone Ranger Theme Tune. Took many years to discover it was the William Tell Overture.
There was an old definition of a highbrow as being someone who, hearing William Tell overture thought of Rossini and not the Lone Ranger
Pretty much anything by Bach.
But Gould's Goldberg Variations are especially good.
Which one? The 1955 or the 1979?