B'nai Jeshurun stands on 88th Street among expensive Upper West Side apartments, an impressive synagogue in an elegant Moorish style. It’s best known for lively and well-attended Shabbat services, which can attract thousands of congregants, including a distinctive, progressive core of Jewish movers and shakers. Attorney General Eric T. Schneiderman has attended, as well as Representative Jerrold L. Nadler and the actor Rick Moranis. Services famously include lively music. Congregants sing, clap and dance. Some might break down in tears.