The phrase "a much less famous" is correct and usable in written English.
It can be used when comparing the fame of two subjects, indicating that one is significantly less famous than the other.
Example: "While many people know about the Beatles, there are a few bands that are a much less famous but equally talented."
Alternatives: "far less renowned" or "considerably less well-known".
Bazzana, the author of an incisive study of Glenn Gould, follows up with the extraordinary story of a pianist much less famous but even more eccentric, Ervin Nyiregyházi.
Jarrell, a poet much less famous than his talent deserved, wrote this satirical novel after spending time teaching at Sarah Lawrence College.
Eric T. Peterson, the chief executive of Twitalyzer, points out that some of the most influential users also make a big effort to respond to much less famous people with personal messages.
The larger company, bearing the proud title Les Ballets Russes de Monte-Carlo, featured the choreography of Léonide Massine; the smaller, ephemerally titled Les Ballets 1933, was a showcase for Diaghilev's last choreographer, the younger and much less famous Georges (as he was then) Balanchine.
Equally impressive, if much less famous, is Intimachay.
Guy Carawan was not on the Lincoln Memorial steps on August 28 , 1963 and he is much less famous than the artists invited to perform at the march, but he nevertheless had a profound influence on the civil rights movement and subsequent crusades for justice around the world.
That generates a much less formal process.
MLB went in a slightly different direction in 2011, licensing a song from the much-less-famous, and much-less-American, British rapper Tinie Tempah.
His five works of public sculpture in Manhattan, and dozens of similar works in Los Angeles, Philadelphia and other cities, guaranteed him a vast audience every week, yet he remained, if not obscure, much less than famous.
