ACCIDENTALS HAPPEN is a diverse scale book which includes scales from classical, jazz, blues and a variety of world music traditions. In this book are 26 scales notated in all 15 key signatures. The scales in this book are: Major, Harmonic & Melodic Minor, Dorian, Phrygian, Lydian, Mixolydian (Dominant 7th), Aeolian (Natural Minor) & Locrian Modes, Major & Minor Pentatonic Scales, Spanish/Jewish, Hungarian Minor, Arabic, Hindu, Augmented, Lydian Augmented, Major & Minor Diminished, Whole Tone & Diminished Whole Tone, Harmonic Major, Blues, Bebop, Lydian Dominant & Chromatic scales. It includes reference material on 25 scales, the "Circle of Fifths," key signatures & enharmonic equivalents. Half steps are shown in all scales where applicable. In this book for OBOE, the note range goes from low Bb (A# in Minor Scales) (Bb-2nd space below staff or A#- 2nd line below staff ) to high A (on 5th space above staff). A great preparation for improvisation.