class_name Tempo
	
static func get_crotchet(bpm):
	return ((60 / bpm) * 1000)
	
static func get_bpm(crotchet):
	return ((1000 / crotchet) * 60)
	
static func beat_at_time(time, bpm):
	return time / get_crotchet(bpm)
	
static func time_at_beat(beat, bpm):
	return beat * get_crotchet(bpm)