Light My Fire by The Doors just bursts open from the very first note and delivers in spades. For once, I'm not going to comment on the words, they mean very little to me in this case (and are far more direct than most Doors lyrics, not being written by Morrison).
What I will mention is the music - surely one of the greatest instrumental sections in all popular music (far too long to be called an interlude, lasting from just over a minute in, right through to the latter part of the 6th minute of the song). I love the organ and its almost hypnotic effect and the cool sweep of the guitar. Yes, Morrison's singing helps it along but, in truth, it isn't his best and isn't the decisive factor in the song's greatness. It's the playing that carries all before it.
To be played loud.