I've been using Last.FM to keep track of songs that I played in my computer. It creates my own top chart. But I noticed that there is a problem; how to differentiate artists with the same name. For example, in the 70s there was a band called "Angel". Apparently there is also an artist by the same name. (See this page.) The statistics for "Angel" is incorrect. For this particular example, the description of "Angel" is the rock band, but the top songs came from the newer artist.
Another example, is "Angels and Airwaves" the same as "Angels & Airwaves"? A small difference. The names refer to the same band, but computer cannot distinguish them. In last.fm, the tag "Angels and Airwaves" contains a message saying that the tag is incorrect and we should change it to "Angels & Airwaves."
To solve this problem there should be an index of all artists and songs in the world. We could use the index to identify songs. I think this is doable. At least, if it is done by Google or Yahoo or company that has huge computing and database resources. Any taker(s) out there?