徵 (zhǐ) is the 4th of the 五音 (five tones) of the classical Chinese pentatonic scale: 宫商角徵羽. It roughly corresponds to 'sol' in solfège. When read as zhēng, the same character means 'to levy/summon' — two completely separate words sharing one character.
usage
In modern simplified Chinese, 徵 as 'to levy' is simplified to 征. But 徵 in the musical sense retains the traditional form.
