"Dangerous webpage blocked" on trying to open your link, Jack!

My best way to learn anything is MY way, and everyone else will have THEIR own way, i.e. there is no one good suit-everyone way.
To learn my lines or songs in various am-dram productions I've been in, was to make myself up a CD or tape of the words with my own lines missing, which I would then have to fill in. For learning musical stuff, I would have 1) a recording of my alto part for note learning, then 2) a recording of a professional production to consolidate words and singing alto part against all the other parts. Most of this hard work would be done in the car, to the possible consternation of other road users!
Again, for learning songs, I would just sing along to a recording until the words were embedded; tunes come much easier for me than words! After that, it's sing them through without any backing, in the shower!