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...
 She's got a ticket to ride,
But she don't care.
 ...
My baby don't care, my baby don't care.
My baby don't care, my baby don't care.
My baby don't care.

In this Beatles's song My baby and she have come with the second person tense of do.How is it?Is this mistake common in informal speech?
Thanks
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Hi,

Yes, this use of 'don't' is common with people who have poor grammar, and sometimes with people who want, for various reasons, to speak in a less educated manner.

It's fractionally easier to say than 'doesn't', I think, which may also be a factor sometimes.

Best wishes, Clive
Comments  
Students: We have free audio pronunciation exercises.
If you can understand the lyrics of a song on the pop chart nowaday, it's an achievement!

With all seriousness, song lyrics are not a very tool for learning English.

This is an oldie I like "He ain't heavy, he's my bro-th-er"



Yes,The Hollies are great.