The Shellye Valauskas Experience’s Box It Up is a box of secrets, surprises and delights. By the time she formed the band, vocalist/guitarist Shellye Valauskas was an established solo performer, winning the New Haven Advocate’s Grand Band Slam readers’ poll and rating a slot in New York’s CMJ Marathon several years in a row. As her songwriting collaborator and bandmate, she enlisted ace guitarist Dean Falcone, who’s served the Connecticut music scene since the early ’80s with Jon Brion in The Excerpts, his own Dean and the Dragsters, and a host of others.