Described herein are techniques for adjusting notes of a first musical piece based on chord data of a second musical piece. A first musical piece is accessed, wherein the first musical piece comprises a plurality of notes. Chord data associated with a second musical piece is accessed. One or more of the plurality of notes are compared to the chord data. An aspect of the one or more of the plurality of notes is changed based on the comparison.

An imaging device includes an image sensor, a controller, and an annunciator. The image sensor is configured to capture an object image entering via an optical system. The controller is configured to control focusing operation to focus the object image by the optical system. The annunciator is configured to output focusing sound that has a predetermined frequency characteristic according to the focusing operation. The frequency characteristic of the focusing sound includes a first sound component based on first frequency, and a second sound component based on second frequency that is higher than the first frequency and lower than twice frequency of the first frequency.

An imaging device includes an image sensor, a controller, and an annunciator. The image sensor is configured to capture an object image entering via an optical system. The controller is configured to control focusing operation to focus the object image by the optical system. The annunciator is configured to output focusing sound that has a predetermined frequency characteristic according to the focusing operation. The frequency characteristic of the focusing sound includes a first sound component based on first frequency, and a second sound component based on second frequency that is higher than the first frequency and lower than twice frequency of the first frequency.