For this 21st episode of Music Theory in 5 minutes, let's talk about the most used scale for improvisation, namely the Blues scale. It is a scale that is the result of years of repetitive use of unoxthodox practices. And then it became one of the first a beginner guitarist wouldl earn for improvisation. We'll see what makes it unique and we'll also have a look at the special 7#9 chords, also called the "Hendrix chord".