Episode 175: Tim O'Brien is one of several roots music icons who've circled back for a second visit to The String in recent weeks, and that's a great thing. His band Hot Rize dominated bluegrass in the 1980s and since the 90s he's been a dynamo of songwriting, ensemble playing, recording and collaborating. The latest project He Walked On finds Tim reflecting on the accelerated, unnerving world unfolding out his window during the pandemic with his signature mix of old-time tradition and contemporary songwriter sensibility. Also, an introduction to Nashville bass player Geoff Saunders, an academy trained jazz artist and composer out with his debut as a band leader.