She tuned the guitar up by a semitone to match the singer's vocal range.

She adjusted the tuning by raising the melody two semitones to match the singer's range.

The composer employed a semitonic inflection to give the melody a slightly unsettling quality.

Her semitonal ornamentation gave the melody a subtle, bittersweet color.

The composer adjusted the melody semitonically to create a subtle sense of tension.

She adjusted the tuning semitonally to achieve the exact microtonal interval.