Madison outfit Boo Bradley grounds its acoustic blues in Scott "Boo" Mullarky's gritty slide-guitar work and Brad Selz's washboard and other makeshift junk-percussion. Unlike a lot of upstart young roots-rock bands relieving the nation's thrift stores of old waistcoats, Boo also has the genuine wear and tear of traveling and street busking in its music—during the warmer months, the group's performances are a favorite on State Street and at the Dane County Farmers' Market. All that mileage isn't necessarily a burden, either: Thanks to Selz's busy rhythms and Mullarky's feel for the acoustic guitar's sonic quirks, Boo Bradley is as warm and fun as blues acts come these days.