A bit over an hour into Queens of the Stone Age’s concert Friday night, Oct. 3, at Detroit’s Fox Theatre, frontman Josh Homme provided some context for the unusual exposition that was taking place on stage. “We`ve been around for a long time,” explained Homme, who founded the group in 1996 following his departure from Kyuss. “Sometimes we do some weird (stuff).”That was certainly an apt description of the quintet’s hour and 45-minute show on Friday. The subtly lit show was divided into three “acts,” with the first five songs performed by the band, plus a string quartet, in front of a red-and-gold curtain. Starting a cappella before Detroit native Dean Fertita joined on piano, Homme performed a stark “Running Joke” that became “Paper Machete” as the other band members came on stage.