Following “The Introduction” and the Snoop Dogg and Kokane-assisted “Gangsta Boogie,” here’s arguably the most appetizing track on J Dilla’s upcoming posthumous LP, The Diary. First previewed at SXSW last month, “The Sickness” finds Dilla trading verses with fellow rap legend Nas over some pounding Madlib production.

Dropping Friday, April 15, The Diary is Dilla’s long lost vocal album from the early ’00s that has since been completed with mixes and masters from his personal archives. You can also look forward to the re-release of Dilla’s Jay Love Japan on May 6.

Listen below…

Related: New Music: J Dilla “The Look” + “Sun In My Face” Feat. Blu & Miguel