Dance forms appealed to Ravel, most famously the bolero and pavane, but also the minuet, forlane, rigaudon, waltz, czardas, habanera and passacaglia. National and regional consciousness was important to him, and although a planned concerto on Basque themes never materialised, his works include allusions to Hebraic, Greek, Hungarian and gypsy themes. He wrote several short pieces paying tribute to composers he admired – Borodin, Chabrier, Fauré and Haydn, interpreting their characteristics in a Ravellian style. Another important influence was literary rather than musical: Ravel said that he learnt from Poe that "true art is a perfect balance between pure intellect and emotion", with the corollary that a piece of music should be a perfectly balanced entity with no irrelevant material allowed to intrude.