John Foster covered Brooks & Dunn's 1991 hit Believe on 'American Idol' on Sunday (May 11). His mom was in the crowd and she could not fight back her tears.

Foster has sung his way into the Top 5 on this season of American Idol. He’s an 18-year-old from Addis, La., so it’s no surprise that for Sunday’s episode he chose two songs with Cajun flavor.