Singer Candye Kane and pianist Sue Palmer — local blues icons — will be appearing at the annual Concerts on the Green series Aug. 7 at 4 p.m. The women have worked together often over the years. Their latest album, “One Night in Belgium,” was recorded on tour during a 1999 European road trip. While their own projects are certainly worthwhile, there is a special spark evident in the music when the two team up. Masters at blues, jazz, torch songs and even honky tonk rock ’n’ roll, Kane’s powerful vocals perfectly match Palmer’s virtuoso keys. With a huge set list featuring everything from standards (“Cry Me A River”) to rootsier material (“Give Me A Pigfoot and a Bottle of Beer”), this concert promises to offer up something for just about everyone.