Here’s a mid-afternoon surprise on the Sony Bloggie stage. Once and future teen idols Hanson have drawn a gigantic crowd and are tearing it up, to genuine audience enthusiasm. They’ve brought along a full horn section, and the still charismatic and supple-voiced Taylor Hanson is rocking — and I mean really rocking — a white piano. The relaxed Maroon 5-like pop-soul is so completely different from anything else heard today that people can’t help but stop and take notice. Lesson in case we need a reminder: Never count out talent.