The title of the third Punch Brothers disc for Nonesuch, borrowed from one of their new songs, is more an exhortation than a taunt. Who’s Feeling Young Now?, contains some of the most exhilaratingly direct, sonically daring performances the group has ever recorded. Band founder and former Nickel Creek-er Chris Thile says, “Punch Brothers has gradually evolved from a band that existed to present the ideas of one guy into a band presenting the unified idea of five guys....When there are five dudes up there doing something as a unit that encourages people to participate, that’s where Punch Brothers is exhibiting a lot of growth. We can actually bring a sense of real musical camaraderie, creative camaraderie, to people who come to our shows and those who listen to the records.”