To call Hank Smith & Lindsey Tims bluegrass is to just scratch the surface of what they actually do. The bluegrass element is certainly there, but their music has a firm rooting in the jazz of the 50's and 60's. The title of their album, Impulse, isn't just a message about the rapid writing that went into it, but also an homage to the jazz label, Impulse Records. Even the cover art pays homage to the jazz records from the Blue Note era.
The second track of the episode, Heyr, Himmna Smithur, is an ancient Icelandic hymn written by Kolbeinn Tumason in around 1208. The title translates to, "Hear, smith of the heavens."
Hank Smith & Lindsey Tims are also a part of Blu Bop (www.flecktonestribute.com), a seven-piece Bela Fleck & the Flecktones tribute band that carries an endorsement from Bela Fleck himself.
Here's a great article about Hank Smith's work and his banjo rig by Allison Hussey of IndyWeek.
Hank and Lindsey are online at http://hankandlindsey.com/
Their album, Impulse, can be heard & purchased at https://hankandlindsey.bandcamp.com/releases