(Credit: Matthew Placek) Anthony Roth Costanzo has stepped into tonight’s performance the “Messiah” with the New York Philharmonic, replacing countertenor Iestyn Davies, who is ill. Costanzo joins a cast of singers that include tenor Joshua Ellicott, bass-baritone Dashon Burton, and soprano Louise Alder. Harry Bicket conducts the performance, which also features the Handel and Haydn Society Chorus under the direction {…}