How to Run a Metronome Over a YouTube Video

First, hear one

Before any of the setup, here is a working metronome. Hit start, drag the tempo, or tap the button in time with whatever is playing to find its BPM.

Why the second-tab approach falls apart

The obvious answer is: open a metronome website in another tab. It works, for about ten minutes. Then:

• Clicking back to the video tab means the metronome tab is behind it, and every tempo change is two clicks and a tab switch.
• Some browsers throttle timers in background tabs, so a naively built metronome can drift or stutter once it is not the active tab.
• Reload anything and the tempo is gone.
• You now have two volume levels to balance across two tabs.

None of these are fatal. All of them are friction, and friction is what ends practice sessions. The fix is having the click and the video in the same window.

Step by step

1. Find the video’s tempo. Play the song and tap along on the beat, six or eight taps, using the tap tempo button above or the one in whatever tool you use. You will land within a beat or two of the real BPM, which is close enough. Tempo Kit’s BPM detection reads it off the connected video instead, if you would rather not tap.
2. Check whether you are tapping the right beat. A common trap: tapping every other beat gives you half the tempo, tapping eighth notes gives you double. If the number looks like 76 or 304 when the song feels moderate, you are probably at half or double time.
3. Set the click, then drop the video’s speed. If you slow the video to 0.75×, the metronome has to come down by the same fraction (a 120 BPM song at 0.75× is 90 BPM). See slowing a YouTube video down.
4. Balance the volumes. The click should be quiet enough to sit under the music but sharp enough to cut through it. If you are burying the click to hear the song, you are not really using the click.
5. Loop the hard bar and leave the click running. This is where a metronome earns its keep (see how to loop part of a video).

The bit most people skip: turn the video off

Playing along with a recording feels like practice and often is not. You follow the recording’s time rather than keeping your own, which means the recording is doing the hard half of the job. The test is simple: mute the video, keep the click, and play the passage. If it collapses, you had learned to follow, not to play.

So the sequence that actually works is: video plus click to learn the part, then click alone to own it, then video again at full speed to check it sits.

Tune before you time

Playing along to a recording with an out-of-tune instrument sounds like a timing problem for about a minute before you work out it isn’t. If the video is in a different tuning altogether, transposing your playback beats retuning six strings. The tuning reference has standard and alternate tunings for 20+ instruments with exact frequencies, and a piano you can drone any note from to check by ear.