Leading tone - The seventh degree of the major scale, so called because of its strong tendency to resolve upward to the tonic.
Mediant - The third degree of the major or minor scale. The triad built on this degree is labeled iii in the major scale, III in the natural minor scale, and III+ in the harmonic minor scale.
Note - The symbol which, when placed on a staff with a particular clef sign, indicates pitch.
Ornaments - Melodic embellishments, either written or improvised.
Perfect pitch - The ability to hear and identify a note without any other musical support.