I find these visualisations give me a deeper feel for the structure of the music and the skill of the composers.

I'm not sure why the freeware MAM MIDI player [1] stopped getting updates but I loved that tool. I had a lot of fun with it and made a video demonstrating its visualisation types. [2]

[1] http://www.musanim.com/Player/ [2] https://www.youtube.com/watch?v=cT6Pk0RNRSA