I am delivering a note to say that there is some choice delivered by the "profesors of music" on the question of the secon tetrachord of the minor scales in that the Note//semitone/Tone/semitone//Note//semitone/Toneandahalf/tone.is not written in stone. the second tetra chord has two more possibilities in this minor scale. See Stuart MacPherson for more details. The version I have given you is the generally accepted format. Hamishmac.
Personally speaking the information I have delivered to you is quite enough to be musically educated/musically literate. It is not a massive exercise. It is a feasible proposition to a quick musical education of good quality.