YOU SAID:

Singing a song don't cost nothin'

INTO JAPANESE

歌を歌うことは何の費用もかかりません

BACK INTO ENGLISH

Singing a song doesn't cost anything

INTO JAPANESE

歌を歌うのに費用はかかりません

BACK INTO ENGLISH

It doesn't cost to sing a song

INTO JAPANESE

歌を歌うのに費用はかかりません

BACK INTO ENGLISH

It doesn't cost to sing a song