"immortal classic" is correct and usable in written English.
It is typically used to describe a work or piece of literature that is widely regarded as timeless and influential, withstanding the test of time and remaining relevant for generations. Example: "Shakespeare's plays are considered immortal classics, as they continue to be studied and performed hundreds of years after they were written."
Recently, I watched the 1939 film made from Victor Hugo's immortal classic "The Hunchback of Notre Dame," set at the end of the fifteenth century.
On Friday night, meanwhile, festival-goers had the treat of watching Powell and Pressburger's immortal classic, The Red Shoes, introduced by Martin Scorsese and his editor, Thelma Schoonmaker, who is Michael Powell's widow.
Cinema expert Simon Fowler has selected the best five films for the North Korean Network, from the "immortal classic" the Flower Girl, made in 1972 to the Marathon Runner, from 2002, based around the real story of Jong Song-ok the athletics champion.
Mrs. Malaprop was born in Sheridan's immortal classic comedy.
And really, who doesn't love the sax solo from George Michael's immortal classic "Careless Whisper"?
A Christmas Carol Amid many worthy area stagings of Charles Dickens' immortal classic, this deftly performed, meta-theatrical edition stands out for fidelity to text, witty stagecraft and heartfelt embrace of message.
Even plays that have yet to claim their places in the pantheon of immortal classics are being revived with a dispatch that might feel premature to some.
A few nights later, just for the hell of it, I watched The Maltese Falcon, another of those immortal classics that always turn up on Best Ever lists by the American Film Institute and the British Film Institute and the Cahiers des Connards.
Aretha Franklin, whose unearthly voice turned songs like "(You Make Me Feel Like) A Natural Woman" and "Respect" into immortal classics, died this morning at the age of 76.
Kim II was heavily involved in certain productions, which are known in North Korea as the "immortal classics".
Among these are such immortal classics as Le Père Goriot, Eugénie Grandet, La Grand Bretèche, and the Droll Stories, whose raciness matches that in the milder "adult" magazine fiction today.
