sentences:  In 1969, he and Bruce Belland, the Four Preps's original lead singer, concentrated on a folk/comedy act as the duo of Belland & Somerville.As such, they appeared in concert with Henry Mancini and Johnny Mathis and were regulars on "The Tim Conway Show," a CBS-TV prime-time comedy series.As songwriters, Bruce and Dave co-wrote "The Troublemaker," which became the title track of two Willie Nelson albums; and the duo sang in a later roster of the Four Preps with Jim Pike of The Lettermen.