This is the 2312th most frequent Japanese word.
かれ
"かれ" (kare) means "he" or "him"; it can also mean "boyfriend" depending on context.
In this sentence, 'かれ' is used as a pronoun meaning 'he', referring to a male individual.
かれは学生です。
He is a student.
Here, 'かれ' is used possessively as 'かれの,' meaning 'his,' to denote ownership.
かれの本を借りました。
I borrowed his book.
Again, 'かれ' serves as a pronoun, 'he,' to describe a male subject's ability in performing songs.