What is this tool called and what is it used for?

it looks like something u would use for building things like a blueprint

Explanation:

the answer is true : 0)

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)