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 BASSOON, the note range goes from low Bb (on 3rd space below staff in Bass Clef) to high E (on 4th space above staff in Tenor Clef). A great preparation for improvisation.