Lynyrd Skynyrd - Free Bird
Undoubtedly, one of the most well-known and overplayed classic rock songs ever. And it is deserving of that status; it is, after all, a phenomenal song. I get that a lot of people are simply tired of it, but a song being overplayed doesn't suddenly make it any less great; it can just make it less enjoyable and less special. Personally, it has never been one of my favorite classic rock songs, but I've always thought it was awesome. Whenever I see those top 500 rock songs list, this is one of those songs you can almost always count on to be in the top 10, unless the originator of the list decided to be cute and put it way lower just to be different. Like Hotel California and Stairway to Heaven, it is universally (at least, as much as a song can be) considered an all-time classic rock great.