When Robert von Bahr started recording classical music 30 years ago for his own label, BIS, he hauled his own equipment, begged record stores to carry his products, and generally did all the things that plucky little doomed labels do to try to stave off their inevitable demise. But the doom part never happened, and today, BIS is one of the most respected labels in the world of classical music. It has an astonishing array of high-quality artists and repertoire in its catalog, a commitment to new music and little-known composers, and a reputation as the leading purveyor of the music of Jean Sibelius, thanks in large part to an ongoing partnership with Finnish conductor Osmo Vänskä, considered to be the leading living interpreter of that composer’s work.