Shorthand for “external line connector,” XLR is nothing more than a fancy name for this three-pronged cable that’s as ubiquitous and essential to the music industry toolbox as the ¼” guitar cable. Got a microphone to hook up? This is your ticket. Plugging speakers into a mixer? Look no further. From Woodstock ‘69 to Saturday night karaoke, this is the cable that made it all happen, and if you’re looking to assemble an audio rig for any purpose, you’ll want a handful of these in your arsenal.