What is the gerund phrase of this sentence One my favorite sounds children singing?

The gerund phrase in the sentence "One of my favorite sounds is children singing" is "children singing".

Here's why:

* Gerunds: Gerunds are verb forms ending in "-ing" that function as nouns.

* Gerund Phrases: Gerund phrases consist of a gerund plus any modifiers or objects that go with it.

In this sentence, "children singing" acts as the subject of the sentence, telling us what the favorite sound is.