Earlier this month, Phish bassist Mike Gordon made a surprise appearance at Temple Sinai in Burlington, Vt., joining the band Nefish Mountain for a cover of First Aid Kit’s “Emmylou.” Gordon’s ...

In another time, before the Internet left music splintered and compromised, First Aid Kit’s heart-grabbing “Emmylou” might have been an international hit. A country-folk-pop duo from Sweden, First Aid ...