Vallejo, California rap veteran E-40 is preparing to release his D-Boy Diary Books 1 & 2 double album on November 18. For the 42-track release, 40 will bring along Gucci Mane, Lil B, Ezale, Mozzy, and more. On Wednesday, the Bay Area legend shared "On One," the first single from the upcoming album. 40 is nothing if not consistent, and the new track is a minimalist slap that's perfect for the function. Listen to "On One" below.