I Youtube some stuff that's apparently 963hz - as you said, I like 963 because of the 3's and Tesla loved the 3's and Derren Brown love's 6's.
Do you know how to tell if the frequency really is 963, or if you can convert 440 signals to 963? Can I convert my music collection to something better? I'm not sure how it works.
It doesn't, really. Musical notes are all different frequencies and real instruments have complex overtone patterns. "440 Hz" means the convention of setting the concert pitch of the A above middle C to 440 Hz. 440 Hz has been one standard since the 19th Century, but it's by no means fixed. These days, many orchestras use 443 Hz as the concert pitch because violins tend to sound a little better (has to do with the scale length and string tension. Similarly, quite a lot of people tend to like the tone of a Stratocaster guitar better tuned half a step lower than normal, no matter the reference). Historically, a variety of lower concert pitches have been used as well. Variety also because tuning forks had variance, but well, as long as the entire orchestra all tuned to the same pitch, it was fine. The concert pitch itself is rather arbitrary, music is all about relative pitches after all.
Given that music, unless it's artificial sine waves, always contains a wide frequency spectrum, there's not really much point in trying to "convert" anything. The frequencies are already in there, anyway. Not that there's really anything magic about 432 Hz to begin with.
Now, if, for some reason, you'd want to "convert" your music collection to 963 Hz or whatever, you can do that by pitch shifting. First you gotta decide what your reference tone should be, for example you could set your A to 481.5 Hz, half the 963 Hz. This means you'd have to pitch up all your music considerably.
Or you pitch it down considerably, to A321, a third. Since you probably don't want to pitch shift too hard, you probably wanna tune down just a little bit, maybe adjust so that the two-lined B, which in A440 is at 987.75 Hz, is at 963 Hz.
In the end, it's music. Look at a spectrogram, you'll see there are a lot of frequencies in there, anyway. Unless you listen to something containing a lot of drone notes at specific frequencies, you won't really get much of a difference.