Incessancy

Or chatter, with incessancy of tongue / Careless, if kind, or cruel, right, or wrong

Most birds confine their song principally to the morning and evening hours, and if they do not do this entirely, they surely quiet down at midday, when scarcely a sound is to be heard, but not so the Yellow Warbler,–morning, noon, and night, he keeps it up, and the incessancy of his singing has become to be a matter of remark.

What troubled them was its incessancy.