to the form. Ii this comuipositioI~ were altered in tone color by being played on a piano, it would lose nuuch An orchestral work from an earlier period, say, Beethoven's lifth Symphony, suffers less in a piano arrangement.
             In modern music, noiselike and percussive SOIl nds are often used, and instruments are played at the very top or bottom of their ranges. Uncommon playing techniques have become normal. l~or exaniple, (1w glissando, a rapid slide up or down a scale, is more widely used. Woodwind and brass players are often asked to produce a flultery sound by rapidly rolling their tongues while they play. And string players frequently strike the strings with (lie stick of (1w bow, ratlwr th~uui di aw the bow across the strings.
             Percussion instruments have become prominent and numerous, reflecting the twentieth-century interest in unusual rhythms and tone colors. Instruments that have become standard during the I 1iOOs in- dude the xylophone, celesta, and wood block, to naiiue a few. (olupos- ers occasionally call for noisema
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