While Copland's earliest musical inclinations as a teenager ran toward Chopin, Debussy, Verdi and the Russian composers, Copland's teacher and mentor Nadia Boulanger became his most important influence. Copland especially admired Boulanger's total grasp of all classical music, and he was encouraged to experiment and develop a "clarity of conception and elegance in proportion". Following her model, he studied all periods of classical music and all forms—from madrigals to symphonies. This breadth of vision led Copland to compose music for numerous settings—orchestra, opera, solo piano, small ensemble, art song, ballet, theater and film. Boulanger particularly emphasized "la grande ligne" (the long line), "a sense of forward motion ... the feeling for inevitability, for the creating of an entire piece that could be thought of as a functioning entity".