Consonances were unison, fifth and octave, just as in the "ars antiqua", and the interval of a third was usually treated as a dissonance, especially earlier in the period. Parallel motion in unison, fifths, octaves, thirds, and occasionally fourths was used in moderation. Composers used passing tones to avoid parallel intervals, creating brief harsher dissonances, foreshadowing the style of counterpoint developed in the Renaissance. After 1350, there was increased use of triads in three-part writing, giving the music, to a modern ear, a tonal feeling. Accidentals occurred more frequently in music of the Trecento than in music of earlier eras; in particular, there was use of F, C, G, B, and E. One A occurs in the works of Landini.