A woodwind-styled electronic musical instrument comprises a plurality of manipulating note keys for designating note names in an octave of the tones to be produced, a plurality of manipulating octave keys for designating octave levels of the tones to be produced, and a mouth manipulating device for controlling the generation of each of the tones to be produced having a note name and an octave level as designated by the manipulating note keys and the manipulating octave keys. The manipulating note keys are arranged on the front surface of the instrument body. The manipulating octave keys are arranged on the back surface of the instrument body around the thumb rest of the instrument in two separate groups, the one group being for shifting up the octave level of the tones to be produced and the other group being for shifting down the octave level of the tones to be produced, wherein the octave level is determined in accordance with the combination of the manipulated octave keys in each of the groups. The octave keys can be selectively manipulated by a rolling motion ol the left thumb without a sliding motion thereof. The mouth manipulating device is arrange at the top end of the instrument body.
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