In songs:
"She don't believe in shooting stars"
"He don't even believe in Jesus"
"Oh, she don't see, the light that's shining"
It is a nonstandard dialect of English.
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Several reasons.
One, pop song lyrics are aimed at hoi polloi. If you use proper English, you will sound like a pedant, and nobody will like you.
Two, poetic license allows it, and sometimes it fits the beat better than "doesn't".
Three, Motown and Hip-hop feature African-American Vernacular English, which uses non-standard forms all the time. The great popularity of such mus