12 notes in music

There are all over only 12 notes in music..
There 7 full notes. Those are:
A B C D E F & G
but there are also 5 semi notes.
A#(A-sherp) or Bb(B-flat)
C#(C-sherp) or Db(D-flat)
D#(D-sherp) or Eb(E-flat)
F#(F-sherp) or Gb(G-flat)
G#(G-sherp) or Ab(A-flat)

So, there are totally 12 notes in music:
A A# B C C# D D# E F F# G G#
THAT'S IT
Everything in music are made on these 12 notes