Searching for a "rar" file of this title likely leads to unauthorized or potentially malicious sites. Below is a report on what the project actually is and how you can legitimately access its contents. Project Overview

It features a selection of 400 essential recordings curated by the editors of Classica magazine to help listeners navigate the vast landscape of classical music.

Instead of searching for a consolidated download, you can access the guide or the recommended music through these channels: La Discothèque idéale de la musique classique (Classica)

To address your request, it is important to clarify that by Bertrand Dermoncourt is a guidebook (literature) rather than a music collection in a single file format like a .rar .