The product of live-wire drum machines and up-all-night energy, house music was invented to make you sweat. But over the years, the music mellowed. Taking on airy vocals and bluesy chords, it borrowed from soul, jazz, disco and even ambient to birth deep house, a sound as apt for Sunday evenings on the couch as it is for Friday nights on the dance floor. These horizontal house classics from the ’90s and 2000s are full of flowing grooves and mood-warming vibes perfect for deep focus and even deeper chill.