Are Jack Johnson and Willie Nelson smoking buddies? It would appear so, since the "Upside Down" singer took to the stage at Farm Aid in Chicagoyesterday (Sept. 22) performed a song he just wrote about smoking weed with none other than vocal marijuana user and festival founder and president Nelson. The song was entitled "Willie Got Me Stoned" and it is a simple yet effective, piano-lead tune that packs a humorous punch.

"I know so many people that, if they could only go to one show a year, they'd choose Farm Aid," Johnson told reporters, citing his happiness for Nelson and the festival. The singer-songwriter is known for combining his music with charity work and, as reported by Rolling Stone Country, began the Johnson Ohana Charitable Foundation in 2008, which donated all of his tour profits to charitable organizations.

US 99.5 reported that before launching in to his weed-influenced song he had written was so new that he needed to read the lyrics direct from the paper when he took the stage saying, "This next song has got three chords in it, and it might be a little too honest." Johnson was backed by his three-piece band, comprised of Zach Gill, Merlo Podlewski, and Adam Topol.

The lyrics read, "Willie got me stoned and took all my money / I was 50 dollars up and then my mind went funny / It didn't really help that I didn't know the rules of the game / And it probably didn't help that I couldn't remember my name."

Jack Johnson is not the only celebrity who's written a song about smoking weed with Willie Nelson, Toby Keith also wrote a country tune called "I'll Never Smoke Weed With Willie Again." Johnson's song was inspired by Willie Nelson's autobiography It's A Long Story: My Life.