An electronic musical instrument provides a player with an assisted performance to offer him/her the pleasure of performing on a musical instrument, and to help him/her in practicing the electronic musical instrument on which a tone pitch of a musical tone to be generated is determined in accordance with the operation of a combination of performance operators, as in the case of a wind instrument such as a trumpet. A number of operating modes are provided to allow the player to independently practice their ability with respect to one or more performance operators or to simply play the electronic musical instrument without an assisted performance.