Springsteen and the Dead have their own bought-and-paid-for channels on Sirius XM,
Fans of these artists whose careers are built around their live show are not interested in format radio. Their music fix is handled by these Sirius channels or other online services. The problem I see is that more alternative bands are building those kinds of fan bases. Their livelihood is based on it. They're being managed in that direction, to super-serve your fans, give them inside access to things, and they'll support the band on the road. Radio isn't part of the equation. Back in the 80s, bands would visit radio stations to promote their records and shows. Now they use Twitter and social media to interact directly. They don't need an intermediary. So it's less likely that alternative format radio stations will attract the kind of listenership they once received. At least as far as current bands are concerned.