Fans hoping for new material from the Pixies might have to wait awhile. Black Francis (Frank Black) is gearing up for Bluefinger. But if the first single is any indication, you won’t mind the delay. “Threshold Apprehension,” which is already available at Emusic (and rumored to appear as a hidden track on next month’s Best of Frank Black ’93-03), summons Pixies classics ” U-Mass” and “Debaser.” Due in September, the album pays homage to the late painter and musician Herman Brood and marks Black’s first solo project billed to his Pixies pseudonym. Best of all, it proves that the man can still wail like he did 20 years ago.