Concert Review and Slideshow: Grace Potter and the Nocturnals at House of Blues

Last night at House of Blues, Grace Potter and the Nocturnals finished off their lively two-hour set with “I’ll Be Your Medicine,” a high-energy rock number that served as a metaphor for Potter’s appeal. “I got the medicine that everybody wants,” Potter sang over and over during the song’s furious conclusion. Yes, Potter has that rock ’n’ roll “medicine” that makes her such a magnetic performer. Showing off a bit of cleavage and wearing a sexy, super-short skirt, the leggy singer has a powerful voice that echoes Janis Joplin’s. And she’s got charisma to spare as she regularly thanked the audience for its enthusiasm and joked about how many drunk people she spotted in the crowd. She even took time out to sing "Happy Birthday" to a member of her crew. Yes, she's got charm to spare.