Mass Appeal’s Live at the BBQ showcase at SXSW, Nas previewed a new track called “The Sickness” that finds him trading verses with the late J Dilla. The song, produced by Madlib, will appear on the upcoming Dilla Rap album The Diary, which arrives next month. The track was not previously included on the tracklist, so I presume it’s one of the two bonus tracks that you see on the iTunes listing.

Watch below.