I am a professional musician and full-time music teacher. I use a software metronome on my Mac every single day and couldn't believe how sparse that decent metronome options are for OS X! Ron Fleckner's Metronome is far and away the best of the lot! The customizability and make this the best of the lot! Don't hesitate downloading this one first and then compare them to the others and you will find that this one is the champ!