Hi so i was wondering how you guys know the exact bpm of a song, the most of the times i do it myself by reproducing the beat with my finger or sometimes the bpm is very simple like 180 or something but for exemple for this song https://www.youtube.com/watch?v=UOvBPG0RCfA&list=PLlfFf3Pc76RvlhpRn0543T2bN0kS5SyJ-&index=3&t=0s and more precisely at the drop at 1:21, everytime i try to put the bpm myself it end up by an enormous beat gap later in the song, i tryed to search it and google and they say it's 109BPM but again at the beginning it's good but at the drop it is absolutly not well timed. plz help me