V4 motorcycles are my favorite sounding bikes! Also arguably the best engine configuration for bikes as well. 3 of the 4 manufacturers in MotoGP use v4s and they sound amazing.
I had a co worker with a 6 cylinder Honda Valkyrie. I don’t believe it’s possible for a bike (or maybe even a car) to have a better sound:
https://youtu.be/eoo5f7FkuDU