"Function" is the third single from E-40's 16th studio album The Block Brochure: Welcome to the Soil 2.

[2] An audio of the song was also released to YouTube on January 14 and has over 4.5 million views.

[3] Waka Flocka Flame, Kreayshawn, Roach Gigz, Bobby Brackins, Philthy Rich, B-Legit, and DJ Amen make cameo appearances in the music video.

When reviewing for The Block Brochure: Welcome to the Soil 2, Allmusic stated that "Minimal bass and scrappy attitude turn "Function" into a five-star pusher anthem.

"[5] The official remix features Chris Brown, Young Jeezy, Problem, French Montana & Red Cafe.