There’s not a Pearl Jam fan out there who doesn’t have Jeff Ament’s hypnotic bassline from “Master/Slave” sewn into the reptile part of their brain. Though likely drawn to Ten via the singles played on radio and MTV, a bit of the instrumental preceded “Once” as the first thing 99% of folks heard on their first listen of Pearl Jam’s debut. With clattering percussion and all manner of droning instrumentation, “Master/Slave” is indispensable to the magic of the record. Without the song bookending the album, Ten would be just another straight-up modern rock record (well, not exactly of course). But “Master/Slave” adds much needed mystery and ambiance, like stage curtains lifting and falling on either end of a dramatic production.