Nationalism, 151, 153. Nebel, 33. Nero, 94. Neumes, 115. Notation, 114, 208. Notation (Greek system), 88. Nithart, 167, 171. O. Oboe, 13, 44, 139, 177. Ockeghem, 177. Octave (Greek system), 86. Opera, 178, 206, 208, 210. Organ, 33, 94, 132. Organ pedals, 134. Organs (portable), 134. Organum, 128. Orientalism, 151, 173, 204. Osiris, 8, 47. Overture, 189, 216. P. Paean, 75. Palestrina, 176, 186, 205, 210, 246. Pan's Pipe, 9, 10, 11, 12, 62. Pantomime, 93, 177. Passecaille, 181. Passepied, 182. Passion plays, 125, 206. Pavane, 182. Pentatonic, 149, 151. Pergolesi, 210. Peri, 209, 231. Period, 179. Periodicity, 24, 28, 265. Peru, 66, 67. Pescetti, 195. Phrase, 179, 190. Phrygian mode, 76, 83. Piano, 29, 230. Piccini, 213. Pindar, 27, 72, 90. Pipe, 6, 10, 11, 13, 14, 28, 30, 37, 44. Pitch, 269. Plato, 11, 49. Plutarch, 195. Poe, 266. Poetry, 24. Polacca, 182. Polka, 183. Polonaise, 182. Porpora, 210. Portuguese, 152. Prelude, 189. Prescott, 66. Procrustes, 27. Programme music, 190, 199, 203, 255. Psalms, 34. Psaltery, 33, 131. Ptolemy, 85. Purcell, 176. Pythagoras, 49, 72, 79, 82, 97. Q. Quarter-tones, 38, 39. R. Raff, 269, 271. Raga, 39, 40. Rameau, 136, 178, 186, 191, 196, 199, 210, 239, 240. Ravanastron, 137. Rebec, 138. Reed, 45. Reichardt, 194. Repetition, 266. Rhythm, 14, 15, 25, 26, 27, 74, 117, 142, 190. Rigaudon, 180. Rig-Veda, 35. Rimsky-Korsakoff, 224. Robin et Marian, 207, 208. Rockstro, 194. Rolle, 196. Romans, 46. Romanticism, 212. Rosseau, 212. Rossini, 210, 215, 217. Rowbotham, 23, 68. Rubinstein, 224. Ruskin, 21. Russia, 152. S.