One of the Gorillaz's biggest hits came by following the instructions in a book called "How To Write a Hit Record".

Bust out your turntables, headphones, and reading glasses. You too can be a hit music maker with the help of a little instructional book! At least, that's all it took for rapper Del The Funky Homosapien to create the verse for the Gorillaz hit song “Clint Eastwood.”

Del hails from the town of Oakland, California where he may just be one of the most skilled rappers in the bay area. He first came onto the scene when he joined his cousin's posse, a recognizable fellow that goes by Ice Cube in the early 1990's. Since then his career has spanned nine solo albums over 2 decades—a rare feat in the rap world.

In 2002 he read a book titled “How to Write A Hit Record” and wrote the lyrics for the Gorillaz song “Clint Eastwood.” All he had to do was follow the simple instructions and the song became a sensational success.

It managed to make it to 57 on the U.S. Billboard Hot 100 chart and ranks 96th on the UK Top 100 Songs of the Decade for 2000-2009.

(Source)