3 adjectives to describe treble

It was a mingling of the boyish treble of college cries and the menacing shriek of the wild-cat.

It called up paeans of childish trebles from tenement alleys; slipped into the sickrooms of private houses, delaying the advent of crape on the door; and played across the rows of beds in the public wards of hospitals in the primal democracy of the gift of ozone to the earth.

The daughters of music were brought low with her, but, in the last thin treble of second childhood, she trembled forth mild complaints of her neighbours' troubles, but very little of her own.

3 adjectives to describe  treble