The Radio 4 concert I saw on Wednesday was pretty good (even though there were a maximum of 25 people there), but it was made even better by a performance by The Sights, a blues/rockabilly trio from Detroit. Unlike other bluesy bands coming out of Detroit these days, the Sights draw equally from rockabilly/60s rock and blues, making them stand out quite a bit. Also, instead of just having a drummer and guitarist (like the White Stripes, for example), they also feature an organist, which made the band more entertaining and unique.
Their live show was very good. They played some covers (including one of Ray Charles' songs) and material from most of their official releases. The guitarist kept having technical difficulties, but his energy and liveliness completely made up for this.
Listen to Circus, a fair representation of their material.