Somerville native croons as Smokey Robinson in 'Motown'
The Motown sound changed music as profoundly as Bob Dylan or the Beatles did. Jesse Nager knew this almost innately as a 5-year-old bopping around his house in Somerville listening to the Jackson Five.But Nager didn't grasp the full impact of Berry Gordy's sonic revolution until he landed a part in "Motown: The Musical," which runs tomorrow through Feb. 15 at the Boston Opera House.