Conde Nast chairman Si Newhouse and his wife, Victoria, probably aren’t huge fans of dance music. The couple, who are avid collectors of modern art, were heading into the West 54th Street entrance of MoMA apparently en route to the museum’s annual Party in the Garden, from which throbbing bass notes could be heard all the way to Sixth Avenue. But then they just kept on walking. “They didn’t go in,” said one curious witness. And their eardrums thanked them for it.