The 'Into The Woods' star has revealed she got tips on how to play the instrument from the 'Heart Of Gold' hitmaker in a 45-minute private lesson.
She said of their meeting: ''He gave me some advice. He saw all the amplifiers and cords and said 'What is this s***?' ...
''He said crank it up to 11. You've got to turn it up, turn it up loud.''
The 66-year-old star also revealed how the pair met, after being introduced by the director of her latest movie 'Ricki And The Flash', in which she plays a musician.
Speaking on The Tonight Show With Jimmy Fallon, she shared: ''I didn't know how to play guitar, I have been singing for a long time, but not really rock 'n' roll, nobody asked me to. I had my first guitar lesson when I said I would do the movie.
''So Jonathan [Demme; the director] says, 'Come by, Neil would love to meet you and maybe I'll get him to give you a guitar lesson.' So my first lesson was 45 minutes with Neil. He is amazing, it's cool.''
The biggest names in music royalty.
One of the most diverse line-ups we've seen for a major awards show in a while.