Diamond Rio is an American country and Christian music band. The band was founded in 1982 as an attraction for the Opryland USA theme park in Nashville, Tennessee, and was originally known as the Grizzly River Boys, then the Tennessee River Boys. After undergoing several membership changes in its initial years, the band has consisted of the same six members since 1989: Gene Johnson (mandolin, guitar, fiddle, tenor vocals), Jimmy Olander (lead guitar, Dobro, banjo), Brian Prout (drums), Marty Roe (lead vocals, rhythm guitar), Dan Truman (keyboards, organ, synthesizer), and Dana Williams (bass guitar, baritone vocals). Among the group's previous members is Ty Herndon, who became a solo country artist in the mid-1990s.
After assuming the name Diamond Rio, the band was signed to Arista Nashville and debuted in 1991 with the single "Meet in the Middle", which made them the first band ever to send a debut single to No. 1 on the Billboard Hot Country Songs charts. "Meet in the Middle" was followed by 32 more charting singles throughout the band's career, including four more that reached No. 1: "How Your Love Makes Me Feel" (1997), "One More Day" (2001), "Beautiful Mess" (2002), and "I Believe" (2003).
Diamond Rio has recorded seven studio albums, two Greatest Hits compilations, and an album of Christmas music. Three of the band's albums have achieved RIAA platinum certification in the United States. In addition, Diamond Rio has received four Group of the Year awards from the Country Music Association, two Top Vocal Group awards from the Academy of Country Music, and thirteen Grammy Award nominations. The band is known for its bluegrass and rock-influenced country and the near-exclusive use of only its own membership on recordings, as opposed to using session musicians.