The International Submarine Band (ISB) was a country-rock band formed by Gram Parsons in 1965, while a theology student at Harvard University and John Nuese, a guitar player for local rock group, The Trolls. Nuese is credited with having persuaded Parsons to pursue the country-rock sound for which he would later be remembered. Parsons' work with the band predates his better known ventures with The Byrds, the Flying Burrito Brothers, and the Fallen Angels with Emmylou Harris.