The question of the Op is like asking to someone to read only one book for the rest of his life ...
Who will take a romance Harlequin book , or even a classic novel ?
Even Doistoievski could not be up to the task ...And i admired Dostoievsky over most classical writers ...He know what is the soul ... Read the "dream of a ridiculous man" ...Nothing so deep has ever been written before ...It is a short novel by the way ...
The bible or a number theory book are my only choices ...Or the Yi-King ... Guess why ?
We need books to meditate not a linear story; we need music to meditate not simplistic melodies on repeat ...😁
The OP did not ask what is your taste , the OP ask what will resist forever to repeated listenings and which you like for sure ...
People dont get it i think ...
😁
"just ONE".....simply impossible! ...but as mahgister, would be inclined to perhaps a Bach album: Bminor Mass? St. Matthew Passion(Herreweghe coducting)... or an album with Beethoven’s late String Quartets (Brentano Quartet has a beautiful rendition of Op. 132)
I will check the Brentano version ... Mine is Talich ...😊.. I own it but never listened to it because i love Talich ...I had many music i never listened , life is short ... I spend more on books and music than on a audio stereo system by the way ... The opposite of many people...