Indie artists have long dabbled in lo-fi home recording, attracted to the peculiar sonic artifacts of the process as much as DIY realness. Once electronic tools became cheap and easy to use, wannabe bedroom producers everywhere took both tendencies to the next level. Sample whizzes like the Go! Team’s Ian Parton build bangers out of scraps, while Dan Deacon and M83 assemble blurry synth skyscrapers. Even the naturalists in Animal Collective spin a shimmering electronic cocoon around “Banshee Beat”’s quiet reverie.