Heart’s low-end anchor for their current tour is session ace Dan Rothchild, who relies primarily on an early- to late-’70s Fender P bass that’s outfitted with a beefy, Badass-style Ibanez bridge, and an original pickup rewound by Rick Turner. Its coolest features, however, include a Coca-Cola bottle opener (from Rothchild’s underage days when friendly bartenders snuck him libations), a kill switch, and volume- and tone-control holes filled with a doorbell switch and what appears to be a soda-machine lock. His backup bass—a Bonneville Guitars J-style—is used for songs like “Dog & Butterfly.”