Rain - Beatles
Let it Rain - Eric Clapton
November Rain - G'n R
Raining in My Heart - Buddy Holly
Can't Stand the Rain - Ann Peebles
Purple Rain - Prince
It Might as Well Rain Until September - Carole King
I'll Do My Crying in The Rain - Everly Brothers (also Aha, Carole King, [again])
Weather Girls - It's Raining Men
It Never Rains In Southern California - Albert Hammond
Louisiana Rain - Tom Petty
It's Raining Again - Supertramp
Still Raining, Still Dreaming - Jimi Hendrix
Love, Rain O'er Me - The WHO
It's raining, it's pouring;
The old man is snoring.
He went to bed and he
Bumped his head
And he couldn't get up in the morning. (children's nursery rhyme)