Final answer:
The girl in "Beethoven's Moonlight Sonata" played only by ear because she was deaf, relying on the feel of the music rather than auditory perception, similar to how deaf percussionist Evelyn Glennie experiences music.
Step-by-step explanation:
In "Beethoven's Moonlight Sonata", the girl plays only by ear because she is deaf. Deafness, as in the case of renowned percussionist Evelyn Glennie, does not hinder one from engaging with and performing music. Glennie demonstrates that enjoying and interpreting music is about feeling the music through vibrations and other sensory elements rather than solely relying on auditory perception.
Similarly, in the practice of playing by ear, the musician relies on memory and feeling to recreate music. This method is profoundly different from the traditional way of reading from a score. It requires a deep familiarity with the piece and a heightened sensitivity to the musical nuances that can be felt tactually or through other senses.