Add a fourth if your vocals hoarse
Like Mister Ed

from Lupe Fiasco – Form Follows Function Lyrics on Rap Genius

Mister Ed is the name of a TV series about a man and a talking horse (called Mr Ed).

WORDPLAY ALERT

If your vocals are hoarse, you’ll need to have to warm up a little more. Note that Mr Ed is a horse who actually had vocals. Horse/Hoarse. Damn Lupe.

Furthermore, initially lupe hinted in a song that he released a few years back entitled Gotta Eat that the album he was going to drop after The Cool was going to be his last. However because of the strong criticism Lasers was met with amongst his fans, he decided to release FnL2. Therefore this connects with the line “Add a fourth if your vocals hoarse: because, metaphorically speaking, lasers was hoarse. Ultimatly creating the homophone, meaning that it wasn’t that good — thus he added a "fourth” album to his list — FNL2.

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