The Blues Scale
While doing some research on the blues scale for this webpage, I found that, although the scale described below is most-often cited as THE blues scale, it has a complex history, and appears in many different forms. Out of simplicity and practicality, I am going to limit my attention below to the predominant form of the blues scale, while listing some articles that go into more depth in case you're interested. I am not an expert on this subject, so I offer these articles with the understanding that one must be careful of anything one finds on the internet. However, that said, these articles seem to be accurate.
The History of the Blues Scale, by Asher TobinBlues Scale, Wikipedia