Josh Rogosin is the engineer responsible for shaping the sound of NPR's “Tiny Desk.” Now, he runs “Global Sound Concerts,” a music series which travels the world, producing videos in the cities and locations that matter to artists. He's also a judge for WNYC's Public Song Project (which you too can join through April 28). Tonight, he'll be at the New York Public Library’s Stavros Niarchos Foundation Library to lead a free masterclass on recording and mixing. Jenna Li, program manager for NYPL's Studio 40 and Technology Training, also joins us to talk about the the NYPL's recording resources for local musicians.