“The Heliotrope Swing,” a band of young students from Berkley College of Music that play swing and gipsy jazz. Faneuil Hall, Boston, Mass., September 9, 2018. Photo by Gaia De SimoniJeody, the violinist of “The Heliotrope Swing,” Faneuil Hall, Boston, Mass., September 9, 2018. Photo by Gaia De Simoni“The Heliotrope Swing” and a woman from the crowd giving them tips. Faneuil Hall, Boston, Mass., September 9, 2018. Photo by Gaia De SimoniDevlin, the cellist of “The Heliotrope Swing,” Faneuil Hall, Boston, Mass., September 9, 2018. Photo by Gaia De SimoniAlex the accordion player of “The Heliotrope Swing,” Faneuil Hall, Boston, Mass., September 9, 2018. Photo by Gaia De SimoniJeody, the violinist of “The Heliotrope Swing,” clausing the tips box due to the wind. Faneuil Hall, Boston, Mass., September 9, 2018. Photo by Gaia De Simoni“The Heliotrope Swing,” and the crowd. Faneuil Hall, Boston, Mass., September 9, 2018. Photo by Gaia De SimoniJeody, the violinist of “The Heliotrope Swing, “Faneuil Hall, Boston, Mass., September 9, 2018. Photo by Gaia De Simoni“The Heliotrope Swing” Faneuil Hall, Boston, Mass., September 9, 2018. Photo by Gaia De Simoni