Even many years after his passing Tupac and his camp are making an impact on society. The Tupac Amaru Shakur Foundation, founded in 1997 by his mom Afeni Shakur, is promising new tunes in the name of charity.

Before you start thinking along the lines of a post-humous album, the promised new single—which will be available on 2pac.comfor $.99—primarily features several hip hop stars and all sale proceeds will benefit the maintenance of the Tupac Amaru Shakur Center for the Arts in Stone Mountain, Georgia.

Kamil “Muszamil” Beale and Dame Greaseare working with the foundation to not only push the single, but create a bonus mixtape with guest rappers for fans that download the song.

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Chuck D has shared a letter that Tupac Shakur wrote to him detailing the respect he had for the Public Enemy emcee. In his tweet, Chuck wrote, "Letter from Pac, but you should have seen mine."

Shakur begins the letter, written in September 1995, noting how highly he regarded the Public Enemy mouthpiece and how much Chuck's letter of support meant to him. "Back in the dayz, on tour with u, I learned so much from what u did and how u did it," Shakur wrote. "It may be hard 2 C but u have alwayz played a major role in what it is I do 2day."

He went on to offer Chuck a few opportunities for collaboration, discussing a program he wanted to include Chuck in (though it's not clear what the program would be) and offering him a part in a movie. "And 2 push my luck even more, I would be honored if u would appear on this track 4 my next album, Euthanasia," he wrote. "The track is called 'Da Struggle Continuez.' It will also feature Sista Souljah, if God will. So let me know."

At the time he wrote the letter, Shakur was serving time in a New York prison following a conviction on two counts of sexual abuse in the first degree for offensive touching without consent. He mentioned making bail, pending appeal, for his sentence and said he hoped to be free by the time Chuck was reading the letter.

"I just got signed 2 Death Row, so I should be working on this album soon," he wrote. "Thanks again, Chuck! I believe we can make a difference, and I have every intention of doing just that. Stay strong!"

Shakur changed the title of his fifth album from Euthanasia to All Eyez on Me, though neither Chuck D nor Sister Soujah appeared on the album. That same year, he released the Makaveli album The Don Killuminati: The 7 Day Theory, which he finished days before his death. It is unclear whether "Da Struggle Continuez" was ever recorded.

Shakur was released from jail less than a month after writing the letter and was murdered just short of a year after writing it.

Tupac Shakur's Foundation Is Gifting Us With New Music Soon

Read Tupac Shakur's Heartfelt Letter to Public Enemy's Chuck D