Prewar Gibson Mastertone Banjos Trying to identify your old Gibson banjo? You've come to the right place! The Gibson Mastertone banjo set a standard of excellence among four-string players beginning in the jazz era of the 1920s and has been the definitive banjo for bluegrass music ever since five-string virtuoso Earl Scruggs came to prominence as a member of Bill Monroe's Blue Grass Boys in. Note: MIH The Q&A column (now renamed FAQ to conform to I'net practice) was one of the most enduring and popular features of Mugwumps magazine. Before you email your questions, use our Search Engine to look for information anywhere on the Mugwumps website.