How it works
Metronome 66 matches the first movement of Beethoven's Sixth Symphony. German Wikipedia's table of the work gives it Allegro ma non troppo, 2/4, half note = 66. One click there is a whole bar.
Read the full guide
Start
Tap the pad, or press Space. Bars of four begin at 66, each led by a higher click, until the pad is tapped again.
Change the tempo
Tap the number under the pad and type another, or use minus and plus. The same table heads the four later movements with 50, 108, 80 and 60.
Questions and answers
Is 66 BPM the top of adagio?
Yes, in Wikipedia's list of tempo markings. Adagio and Larghetto run from 44 to 66 and Largo from 40 to 66, so three slow markings stop here, where the march-like Marcia moderato starts. Andante, 56 to 108, runs through. Every figure is called very rough.
Is half note = 66 the same as 132 BPM?
In quarter notes, yes: two to a half note makes 132 a minute, by our sum. The Sixth's first movement is in 2/4, a bar that one half note fills, so its 66 clicks once a bar. The 132 BPM page plays the quarter notes.
Was the 66 written when the symphony was new?
No. Both the German and the French Wikipedia articles date the first performance to 22 December 1808, and the German table dates the marks to 1817. Wikipedia's Metronome article puts Beethoven's first metronome mark in December 1815, on the corrected score of a cantata.
Why is 66 a metronome number but 65 is not?
The usual wind-up scale goes up in threes at this point. Wikipedia's Metronome article gives the most common arrangement as 60, 63, 66, 69, 72, which puts a notch on 66 and none on 65. Makers differ, and both numbers can be typed here.
Why can't I hear the metronome?
Start with the phone: is its ring switch on silent, is the volume down, are Bluetooth headphones connected? Sound or no sound, the pad still shows the bar, one dot for each beat and the biggest for beat one.