The District’s jazz scene is known for, if anything, the soulful players that develop within it. There is a certain groove to the D.C. sound that has developed through a combination of highly trained musicians, a rich legacy, and a community that has seen its fair share of ups and downs. These performers share a deep commitment to craft and to the integrity of live performance. Trombonist Reginald Cyntje (pronounced sin-chee) is one of the…