Definitions:
1. Cleft
2. Treble Clef
3. Musical Alphabet:

Clef is a symbol at the left end of the staff showing the pitch of the notes written on the staff.The treble clef is a type of clef that is placed above middle C on the second-lowest line of the staff.The musical alphabet is the notes of music that are sung or played. They go from A, B, C, D, E, F, G and then repeat.

Note:

Not sure if this is what you were looking for, but I hope it helps!

C. gallioli because i remebered it from collage