Tuesday is the summer solstice, the Northern Hemisphere’s longest day, and it’s been a big deal for music since the Stone Age. There must be something about the sun refusing to set that makes cultures want to dance, sing, and party. It’s the Midsummer that Shakespeare named a play after, also known as St. John’s Feast Day, and the Wiccan holiday of Litha. Druids gather at Stonehenge to sing at dawn; Norwegians sing around huge bonfires far into the sunlit night. The ancient observance of the