Animal Collective, ‘Merriweather Post Pavilion’: Aidin Vaziri | What happens when Deadheads discover drum machines? Animal Collective’s ninth studio album may offer a best-case-scenario answer, mixing kaleidoscopic “Pet Sounds” harmonies with droning computer blips, chaotic dance beats and hypnotic tribal rhythms. It’s the most accessible thing the Baltimore band has done, but that doesn’t make “Merriweather Post Pavilion” easy listening (you should hear the other eight albums). This sprawling album aims to find the middle ground between cosmic Disney soundtracks and calculated Krautrock, offering just a few conventional tunes amid the wash of blissful white noise. But when exceptions such as “My Girls” and “Summertime Clothes” break through the surface, it can be fleetingly marvelous.