When he was seven, Ravel started piano lessons with Henry Ghys, a friend of Emmanuel Chabrier; five years later, in 1887, he began studying harmony, counterpoint and composition with Charles-René, a pupil of Léo Delibes. Without being anything of a child prodigy, he was a highly musical boy. Charles-René found that Ravel's conception of music was natural to him "and not, as in the case of so many others, the result of effort". Ravel's earliest known compositions date from this period: variations on a chorale by Schumann, variations on a theme by Grieg and a single movement of a piano sonata. They survive only in fragmentary form.