The goddamn lyrics say "black and yellow" due to meter. You know, the number of syllables in a sentence.
Poetry (and for a very long time, song writing) incorporated two - THAT MEANS TWO, NOT ONE - element: rhyme and meter. Rhyme is self-explanatory.
Meter refers to the mixture of syllables, both emphasized and non-emphasized, in every line. Samuel Taylor Coleridge's "Rhyme of the Ancient Mariner." Note how he uses the emphasized syllables to tell the tale:
"The fair breeze blew, the white foam flew,
The furrow followed free.
And we were the first, to ever burst,
Into that shining sea."
Do you recognize how the number of syllables and the mixture of emphasized and non-emphasized syllables mix together beautifully??
Compare these two choruses:
"Uh huh, you know what it is
Black and yellow
Black and yellow
Black and yellow
Black and yellow
Yeah uh huh, you know what it is
Black and yellow
Black and yellow
Black and yellow
Black and yellow"
Compare that to:
Uh huh, you know what it is
Black and gold
Black and gold
Black and gold
Black and gold
Yeah uh huh, you know what it is
Black and gold
Black and gold
Black and gold
Black and gold
Black and gold
Black and gold
Black and gold"
You do see the different meter, don't you??