Felly has been around for a while now. His production style and flow have developed over the years and although he has a loyal following and big streaming numbers, he remains largely under the radar. Ambroxyde, his 2025 release, “is the start of something new,” Felly says. The title refers to a molecule in perfume and the memories that smell can evoke. As the album carries us into the next chapter in Felly’s career, we have a chance to see its beginning at the Music Hall of Williamsburg. —Henry McGrath