When I first heard Tegan and Sara’s “Closer,” I thought, “Uh-oh.  Are their fans going to think they’ve sold out?”  But then I got to thinking about their earlier songs and I realized that even though they’ve spent their career as an “indie” band, they’ve always had a pop sensibility.  They just haven’t had the polished production that can be heard on “Closer.”  But it certainly sounds like something they’ve always wanted to do.  And if it makes them more accessible, then great, more people ought to be listening to them.