Home Free is an American a cappella group of five vocalists, Austin Brown, Rob Lundquist, Adam Rupp, Tim Foust, and Adam Chance. Starting as a show group, they toured around 200 shows a year across the United States.

These are two video's of "The Diamonds" singing "Little Darling".  They are 47 years apart.  The singer on the left is the lead singer and is the father of Tom Hanks

THE DIAMONDS

        The original members were Dave Somerville (lead), Ted Kowalski (tenor), Phil Levitt (baritone), and Bill Reed (bass). Doo-wop http://en.wikipedia.org/wiki/Do-wop is a style of vocal-based rhythm and blues music, which developed in African-American communities in the 1940s and which achieved mainstream popularity in the 1950s and early 1960. With its smooth, consonant vocal harmonies, doo-wop was one of the most mainstream, pop-oriented R&B styles of the 1950s and 1960s.