Look at the simplicity of the chart for 1980. You put out a record and maybe a cassette and call it a day. Easy if you had a good song.
Now look at the chart for 2010. Holy shit. No wonder everyone is running around mad trying to figure out how to monetize everything in sight. On one hand the music business has more touch points than ever before. On the other, it’s too fragmented – no one entity can control all of these revenue sources.