Joseph Ehrenpreis is a multi-instrumental guitar performer. His specialization includes the 8-string “Brahms Guitar,” an instrument invented by David Rubio and Paul Galbraith in 1994 that uses an endpin and a resonance box, boasting an extended upper and lower range. Ehrenpreis, a native of Skokie, currently a student at Yale University, describes it as “the love child of my two …