Like finally seeing a beloved, long-lost toy from your childhood again, the geniuses at Disney-Pixar have captured the sense of joy and wonder of what it means to have an imagination for an incredible fourth time in the long-running “Toy Story” franchise, and composer Randy Newman has been there every single step of the way. This essential and affectionate medley includes a taste of every installment: “You’ve Got a Friend in Me, The Ballad of the Lonesome Cowboy, When She Loved Me” and “We Belong Together.”