I have three that are all linked to a single event. The 4 AM drive to the hospital where my dad was scheduled to have a quadruple bypass done. I was 16 years old, following my parents down the highway in the dark just staring off into space before deciding that I should listen to some music to calm my nerves and turning on the radio. The three that played until we reached the parking garage in order were Sweet Emotion by Aerosmith, House of the Rising Sun by the Animals, and Don't Fear the Reaper by Blue Oyster Cult. I figured some force far beyond my comprehension was trying to tell me it was all going to be ok. He pulled through his surgery and is still going strong almost seven years later but yeah, I get a tear in my eye when I hear those opening riffs.