Consider Snoopy. If I look at the snoopy character and draw a similar dog called Smarpy, which isn't quite the same, and perhaps make him a comic book character, is that a derivative work?
How about if you animate it and call the dog Brian?
If you are a derivative work, then you can be subject to copyright infringement.
I am a derivative of my parents. Should I speak to my lawyer?
Unless you decide to keep up in programming languages whatever you learn is going to be completely and uterly useless.
Yeah, like C. It's only been around for about 40 years and it's already totally obsolete.
Are there really that many enterprises using Firefox?
No, because there isn't currently a LTS version.
why can't we put python/ruby on the phone?
Because... we can.
After all, there are only so many combinations of notes
Yeah, have you worked out just how many? Assuming 4 bars of quarter notes and using one chromatic octave (12 notes) and rests: 665,416,609,183,179,841 permutations. And that's only tiny proportion of all realistic possibilities.
Variables don't; constants aren't.