Great Scott! For those of you who haven’t checked your calendar, today is October, 21, 2015 — today is the day that Marty McFly visits the future! To channel our inner sense of time traveling adventure, we’ve compiled a playlist with songs that quite literally travel through the years. Take a moment to think about the fact that after 4:29 p.m. today, all of Back to the Future will be in the past. UGH.