How to memorize I AM NOT YOURS
Sing through Section 1-M.1-9, with music and recording(do this 3X)
Then sing through without looking at the music(do this 3X)
Sing section 2 (M. 9-16) and each following section, listed below, the same way.
Section 4-M. 24-36
Section 5-M. 36-47
Section 6-M. 47-55
Section 7-M. 56-end
Try to combine sections 1 and 2, then 3 and 4, then 1-4, then 5 and 6, then 5 thru 7.
If you do 2 sections a day, you will be able to do this!