The Tonic Triad of C sharp Major

A key signature is the sharp signs next to the clef. In this case we have F sharp, C sharp, G sharp, D sharp, A sharp, E sharp & B sharp (played as the note C) . If you need help here please see the key signatures blog.

The tonic triad is the 1st , 3rd and 5th note of the scale.

When there is no key signature this triad requires an sharp sign in front of the C, E and G to make an C sharp, E sharp and a G sharp.