Fun with scales is my favourite type of book. Why? Because it is not just a boring book of scales that you learn by rote. Instead, each major and minor key (plus chromatic) is written out first as a scale for practice, then is followed by a creative and interesting series of studies in the same key. Learn the scale, yes, then put it into practice by playing music based on its tonality.
This type of study is VITAL to applying your theoretical practice to the art of music making. David Gornston knew this, and he made it the foundation of his teaching style, and I love him for it.
Check out a few for free to the left, then grab an immediate PDF download above.