Answer by taking a quote from the following article:

Robert Wilson "Robb" Royer (born December 6, 1942 in Los Angeles, California) is an American musician and songwriter, best known as a founding member of Bread from 1968 to 1971. While he was with the band, they had a #5 UK/#1 US hit single with "Make It With You". He was replaced by Larry Knechtel in 1971.

In 1982 Royer wrote the song "Quittin' Time" (co-written with Roger Linn) which eight years later was recorded by Mary Chapin Carpenter and won an ASCAP Airplay award. Royer traveled to Nashville to receive the award and stayed with Griffin, who had previously relocated from L.A. to Nashville. Larry Knechtel had also been living and working as a session musician in Nashville. Royer relocated to Nashville in 1994.  Todd Cerney was already a grammy-nominated songwriter when Royer met him in 1994 at Jim Della Croce's house. Cerney had written two top-forty songs (Loverboy's "Notorious" and Restless Heart's "I'll Still Be Loving You," which reached number one on the Country charts). Cerney had established a private recording studio in his home where he engineered a number of other singer-songwriters' albums.  Griffin, Royer and Cerney first collaborated by co-writing the song "Kyrie" in 1994. Knechtel later joined the trio and together they performed and co-wrote songs (including the 1995 song "Slow Train") under the band name "Toast". Toast performed at various Nashville venues including the Bluebird, Third and Lindsley, and 12th & Porter. They wrote and performed their own songs including such titles as "Road Kill," "Knechtelodeon," "No More Smokin'," "Grenadine," "Magdelena," and "Radio Dixie." The group used session drummers for their recordings and performances. The group would later be known as Radio Dixie in 1998. The name change was intended to help with promotion of the group, but the group disbanded by the end of 1998. Royer and Cerney continued to write together, generating additional titles including "Hurtin' Cowboy," "New Orleans Prayer," "I Believe I Kissed an Angel," and "Beside Myself."

why did they disband?