EXCLUSIVE: Here’s a first look at Serino/Coyne ad agency’s TV spot for It Shoulda Been You, a long-shot new musical slated to begin performances March 17 at the Brooks Atkinson Theatre, with official opening on April 14. Staged by David Hyde Pierce (Frasier), the comedy stars Tyne Daly and Harriet Harris and centers on two culturally incompatible families, an ex-boyfriend and a wedding.