One of the first scales I learned to play on the guitar was the pentatonic scale. My teacher taught me all five positions and a few example licks within the first few lessons I took with him. He'd jam a twelve bar blues in E and I would wing a basic solo using this new scale. Here are the five positions of E pentatonic my first teacher made me learn:
I began to notice from that point on that the pentatonic scale was in all sorts of music, meaning that this scale wasn't always being used over the blues. This short little diddy is an example of the E pentatonic scale in use and as you can tell, it isn't quite related to the blues.