Silverman will play a rapper's sharp and sarcastic publicist, who has to suffer many indignities, reported Aceshowbiz.
The 44-year-old satirist will join the comedy trio comprising Andy Samberg, Akiva Schaffer and Jorma Taccone.
The film is set to take place somewhere "in the world of music."
Besides, it will feature parodies of some music hits such as pop stars Justin Bieber's "Never Say Never" and Katy Perry's "Part of Me".