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If possible, before we start animating a job, we love to get the music. The music and the tempo and beats in that music can give us a nice animation grid for where to place cuts, keyframes, etcetera. Now when a composer creates music for you in your project, there are some specific tempos or speeds that they can use that will make your life a lot easier, we call these the magic tempos. And indeed, if you have access to the exercise files there's a folder called Bonus Content that includes a PDF called Magic Tempos.
In it, we described the philosophy of how the tempo of music maps to frames inside your animation. And on the second page we give you a table of what we call the magic tempos, where specific beats per minute, the tempo that musicians like to think of, mapped to very clean, even frames per beat, the spacing in frames inbetween the beats. We gave this list to our musician ahead of time and said, please pick one of these tempos for the music. Now it so happens that the subject of this project is about heart attacks.
So we did a little research to find out what is the common tempo of a heartbeat. We found it can fall anywhere between 60 and 100 beats per minute, with 72 being common. So the musician had asked us what our frame rate was, 23.976, and looked for a tempo that was close to this target tempo of around 72 beats per minute and lo and behold, here's one right here, 71.93. Now the musician knows what tempo to compose our music at. Even if the composer has not done composing the music, if you know that they're going to compose at this tempo ahead of time, you now have a framework for how to space out your animation timing, namely, 20 frames between each beat of the music.
Since we got the music first, I'm going to go back at After Effects, twirl open Sources, twirl open Music, grab our soundtrack finalbeat.wav, and add it to the Final Composition.
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