Trombone parts are typically notated in bass clef, though sometimes also written in tenor clef or alto clef. The use of alto clef is usually confined to orchestral first trombone parts, with the second trombone part written in tenor clef and the third (bass) part in bass clef.
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Aperture priority is the most popular shooting mode for portraits. Using this mode, the photographer sets the f-stop and the camera chooses the shutter speed. Aperture priority mode gives direct control of depth of field. Controlling depth of field means that you can blur the background to draw attention to your subject. Alternatively, you can use Manual Mode.