Animation node to loop?

Question

3D

I want to make loop animation like here https://youtu.be/8PkdH_GXpQE but with blocks (object matrix). I made a musical animation myself, but I don't know how to properly loop. https://blend-exchange.giantcowfilms.com/b/6591/
Or is there a similar thing on Unity where you can read or tell me how to do it?