How does 20th Century instrumental music differ from that of the Romantic period?

With the
Industrial Revolution musical instruments were greatly improved as mechanized keywork permitted
musicians to play more difficult passages. For, they had a better range of keys that were
mechanized which helped keep the instrument in tune. This keywork also made large instruments,
such as the contrabassoon more facile as all the keys are located in a close, comfortable area
for the musician's hands. And, because of these technical improvements, the nineteenth century
is marked by greater freedom in the form, harmony, and rhythm of musical works. Thus, the
dynamics within these musical works became more intense than before because of the added
intensity, vitality, and vigor emanating from such improved instrumentation.

The Romantic period of the nineteenth century gave rise to nationalism, and composers
incorporated such elements as folk idioms, motifs, melodies and rhythms that...

href="https://en.wikipedia.org/wiki/Chromaticism">https://en.wikipedia.org/wiki/Chromaticism
href="https://en.wikipedia.org/wiki/Romantic_music">https://en.wikipedia.org/wiki/Romantic_music