Hi,

Memorization oddly enough is a physical thing. Sometimes people have an erroneous idea that it's mental. If you're learning a song, you have to sing it over and over to get it. Your tongue, lips, and voice have a physical memory. They remember the words. This is true also of guitar, banjo etc. When you are learning something from music, the fingers do the walking and if you play it long enough they will remember where to go. It's really important to try to memorize as much as you can in music because that's the way to internalize it.

Memorize licks on the guitar, scales, songs (words) but sing aloud or with a whisper so your mouth remembers.

Frank