Memorising songs can be easy, but you need to know the best approach: which is to understand the music!
The wrong way to memorise songs
If you try to simply remember the chords to a song by sheer repetition, you will make slow progress. Any guitar player who’s learned some new songs only to find they struggle to play the ones they were working on a few weeks back from memory knows this! It’s not a limitation of the brain’s capacity for information, but simply that the musician hasn’t memorised the song the right way to begin with.
You can make this kind of “memorisation by repetition” more effective, by breaking the song down into parts and memorising each part in tu