It seems every reference to it lists a different source. Wikipedia claims it was set to music by Charles Ives, while others say it's a traditional 18th-century English tune. The Harry Fox Agency lists seven different songs by that title, all with different composers. The US Copyright Office lists it only in compilations (and an episode of Barney). Meanwhile the website pdinfo, a great source of public domain music, notably doesn't include this song.
To get a solid answer, your options are to locate a pre-1923 reference to it, which would make it in the public domain, or to determine whether the exact version you wish to use is one of those listed by HFA.
The old man is snoring in the nursery rhyme "It's Raining, It's Pouring."
ggeageegeagee
snoring
It's raining it's pouring the old man is snoring. e g e a g e e g e a g e
Nobody owns the copyright of a single word. Perhaps you mean trademark.
Barney and Friends - 1992 It's Raining It's Pouring--- 3-14 was released on: USA: 16 March 1995
the coca cola company owns the copyright
A minor owns the copyright on any works they create.
Universal.
The old man is most likely snoring.
Word Music.
Paramount.