Nå kom nevøen min hjem (han bor her til og fra) og han har bachelor i musikk fra Musikkhøyskolen. Han har nå sett på dette og mener det er det som heter "cadential 6-4". Han fant en forklaring som han mener er veldig bra:
www.clarkross.ca/102-Cad64.pdf : "The Cadential 6
4 Chord
I. DESCRIPTION, CONSTRUCTION, AND RESOLUTION
The CADENTIAL 6
4 CHORD is a voice-leading embellishment of the Dominant chord. It involves
two NCTs resolving (almost always) down by step above the bass, which is usually stationary, or may
contain an octave displacement.
"4. The Cadential 6-4
This is the most common use of the 6-4 chord, and if you listen to any kind of music for a little while you're almost sure to hear a cadential 6-4 chord or two. To explain the cadential 6-4 chord, we need to go back to the top-heavyness of the 6-4 chord which I discussed earlier. The upper voices in a 6-4 chord seem to hang rather uneasily over the bass. Were they to both move down in stepwise motion, keeping the same bass note, the resulting triad would be a stable root position chord. This upper voice motion provides a feeling of tension, and thus is often used to enhance the final cadences of a piece. .."