One can say that he is the natural successor to Claude Debussy and Maurice Ravel. He won numerous prices for his works and his pieces are often performed.
One of his most performed pieces is Métaboles from 1965. It is a orchestra piece in 5 movements. In four movements he highlights different parts of the orchestra and then brings the different parts together in the fifth.
The cello concerto Tout un monde lointain from 1970 written for Mstislav Rostropovich is considered one of the most important cello concertos in the 20th century. The piece is inspired by the work of Baudelaire and each movement begins with a quote from his Les fleurs du mal.
Correspondances is a late piece, premiered in 2003. It is a song-cycle for soprano and orchestra. The texts is based on letters written different persons, for instance Vincent van Gogh and Alexander Solzhenitsyn. Each part highlight a different family of instruments.