Harry Shearer is known for doing many characters, including Mr. Burns and others from “The Simpsons,” but the most famous is Derek Smalls, the saturnine, epically muttonchopped bassist in the movie “This Is Spinal Tap.” Almost thirty-five years after the release of Rob Reiner’s mockumentary about a struggling metal band, Shearer has given Smalls a new lease on life. Although the character is fictional, the new solo album, “Smalls Change: Meditations Upon Ageing,” is real. Smalls tells The New Yorker’s Andy Borowitz that he produced the record with support from the British Fund for Ageing Rockers, and it contains songs about a toupee (which belongs to Satan) and erectile dysfunction. (You have to give the dysfunctional part, Smalls says, “a good, stern talking-to.”) And they discuss what is clearly a sore subject: the fact that Spinal Tap was never inducted into the Rock and Roll Hall of Fame. Plus, a New Yorker editor picks three favorites for a new parent.