How green screen work?

basicially when you put a green screen in the back and use a video editor, you have the option to choose chroma key... which basically gets rid of the color you want. If you chose green or blue, for example, it will get rid of the green or blue parts of your video/photo.

Explanation:

c, d, e, f, g, a, b, and c.

sometimes western music will also use solfege. the names of these are do ra me fa sol la si (or ti) and do.

to indicate a note a half step higher or lower then the original note, you would say c # (for a half a step above c) or bb (for half a step below b)