Now for something different!
Look at this great chart of the Genealogy of Rock and Roll.
You can use the magnifying glass to see the details of the chart - put your mouse arrow on the glass, keep your finger on the mouse button and move it around.
I spent an enjoyable 10 minutes checking out all my favorite artists. It's interesting to see whole genres of music die out and sprout up. And some genres hang on by a thread and then blossom. Kind of reminds me of my ancestral families.