[stylist] question about song lyrics

[Chris Kuell]

Greetings,

I'm reading a manuscript (on my VR Stream - thank you very much) and have a question about the use of song lyrics in a novel, for those who know what they are talking about. In one place, a character is listening to the radio when a favorite John Mayer song comes on and the main character sings along for a few lines, "I'm bigger than my body, bigger than my body, bigger than my body gives me credit for..." 

At another point she's in the shower singing the first four lines of Pat Benatar's 'Love is a Battlefield'. 

In both of the above cases, the song lyrics compliment the theme of the scenes.

My question is--is it okay to use these lines without permission? Is it okay to use these lines if the author references the song, artist, label and date recorded/produced at the end of the book? Or, should the writer not use the lines unless he gets permission from the artist?

Thanks,

chris