I haven't had any real education in MT so I might ask the wrong questions or my confusion might be based on lack of fundaments so please bare with me and I will try to explain.
Starting to learn MT and harmony I've been only familiar with music that is based on one scale from where most of the chords are taken from and the same scale is also used for the melody and sólo. Of course I understand that non diatonic chords and notes can sound great at the right moment.
But then I seem to encounter exceptions to this that sounds amazing. But I'd like some explanation on how this works. These are some of the things I've encountered if I've understood them correctly.
In jazz improvisation it seems that each chord can be understood as a whole scale and the improvisation solo will change scale for each chord. So the i guess that song is not said to be played in a certain one scale?
I realised blues can be played with a scale more like the minor for the solo but the chords accompaniment being in the mayor scale? Is this correct?
Same seems to go for klesmer music using the freygish scale for playing solo but often when I see instructions for a backing track the chord seem to be from a normal minor scale?