Alternálóharmadik

Alternálóharmadik is a term used in some musical contexts, particularly in Hungarian music theory, to describe a specific intervallic and harmonic relationship. It translates roughly to "alternating third." The concept typically refers to a situation where a dominant chord or a related sonority is followed by a tonic chord, but with an intervening chord that creates a sense of modal mixture or chromatic alteration. This alteration often involves a third that is chromatically lowered or raised relative to the diatonic third of the tonic chord.

The effect of Alternálóharmadik is to create a richer, more colorful, and often more dramatic transition to the tonic. It can add a sense of yearning, melancholy, or surprise, depending on the specific context and the direction of the chromatic alteration. This technique is not a standalone chord but rather describes a harmonic progression or a specific way of approaching a cadence. While not a universally recognized term outside of certain theoretical circles, the underlying musical phenomenon it describes is found in various musical traditions, particularly in romantic and post-romantic eras. It is often associated with composers who explored chromaticism and modal interchange extensively.