Tonic - The first note of a key. Also, the name of the chord built on the first degree of the scale, indicated by I in a major key or i in a minor key.
Ancora - Repeat.
Complete cadence - I-IV-V-I progression.
Double sharp - A symbol for raising pitch one step.
Mode - Any scalewise arrangement of pitches; more generally, the term refers to the patterns upon which medieval music was structured, the patterns which preceded the development of major and minor scales and tonality.