Give some stream of consciousness and then the answer. Merry Clayton (born December 25, 1948) is an American soul and gospel singer and an actress. She provided a number of backing vocal tracks for major performing artists in the 1960s, most notably in her duet with Mick Jagger on the Rolling Stones song "Gimme Shelter." Clayton is featured in 20 Feet from Stardom, the Oscar-winning documentary about background singers and their contributions to the music industry. In 2013, she released The Best of Merry Clayton, a compilation of her favorite songs.

Answer this question: who sang with the rolling stones on gimme shelter?
The relevant information is: She provided a number of backing vocal tracks for major performing artists in the 1960s, most notably in her duet with Mick Jagger on the Rolling Stones song "Gimme Shelter."
Therefore, the answer is Merry Clayton.