I count The Beatles as one of my favorite bands and as one of the most important musical groups of all time. Here is an evolutionary trip down Beatle Lane. See how they changed and music changed with them.
This first one takes about 15 seconds to start.
This one has been cleverly presented in the World of Warcraft format.
Holy God, there's so much more that I could post, but if you haven't gotten it yet, then you never will (and I pity you if it's so).