Mix of stuff in the logo. The multicolor waveform reacting to the music and the transition with of the text with "random" colors.
The entering animation need to start with another color before starts
The waveform reacting to the music, but before it does that, some extra simple stuff in javascript. What it does it that first it waits for all the "balls" from the waveform to appear, then after some frames, I give the animation free range to be used with regular keyframes and after with do that, we go to the music waveform.