My guests this week are Ruth Oxenberg and Rob Schumer.They join me to talk about a very special series of concerts they've curated called Bluegrass on Hudson, which are happening at The Fisher Center for the Performing Arts at Bard College, in New York's Hudson Valley.But we start by talking about a wonderful documentary they directed and produced called Bluegrass Journey. It's a movie I've watched multiple times and really love. We chat about how they got into bluegrass in the first place (i...