the numbers refer to the chords, eg 1 is the first chord in the key 4 is the fourth and 5 is the fith. u can find these chords by taking a scale and finding the first fourth and fith notes in it, these are the root notes of these chords.

for example these notes are G C D. in G majour ( the first mode)

to find the remaining notes in these chords you do a method called adding thirds. for example for the chord with its root on the first note of the scale, also play the third note of the scale and the fith and the seventh.


for the 4th chord of th scale play the 4th, 6th, 8th (or 1st), and 3rd

for the 5th chord of the scale play the fith, 7th, 2nd, and 4th.

this will create 3 seventh chords.

hope this helps, if your still confused i will work out the chors for you but i am guite tierd now and want to go to bed.