At the halfway point of the Main Street Live summer concert series, Timeline will be performing a Beatles tribute Friday night beginning at 7 p.m.Timeline is a four-member band from Nashville. The band consists of boB Wilson on six- and 12-string guitars and vocals; Chris Schafer on bass and vocals; Phil Wolfe on keyboard, guitar, harmonica and vocals; and David Chandler on drums and percussion.“We have not played Main Street Live for a couple of years so we are really looking forward to it,” said Wilson. “There is always a great audience.