Last week belonged to the Saturn Bar. This week, the House of Blues is the place to pitch a tent for quality twofer concerts. The mini music festival began yesterday with Son Volt and Peter Bruntnell. It peaks tonight (8:30 p.m.; tickets $12.50) with Elvis Perkins son of Anthony and author of one of the year's best albums, Dearland (XL) and Alabama troubadour AA Bondy. Tomorrow's denouement features the Swell Season (the Oscar-winning former-cutesy-couple from Once film fame) and Joni Mitchell ringer Rachael Yamagata. Just pretend those Ticketmaster service fees are a good-music tax and skip the second Jameson.