Usually refers to any of the early scales e.g. the Dorian mode, but can also be used more generally to describe music in the Major mode (Major key) and Minor mode (Minor key). The example is of the Dorian Mode
Harmonic Minor
As the title suggests this is the “version" of the Minor scale used in harmony. It is different from its melodic counterpart in that the interval between the sixth and seventh degrees of the scale is an augmented second in both the ascending and descending forms. Listen to an example.
Melodic Minor
As suggested by the name, this version is used when writing a melody in the minor key. Formed by raising the sixth and seventh degrees of the scale a semi-tone in the ascending form and by lowering the sixth and seventh degrees in the descending form. In this way the ungainly augmented second of the harmonic scale is avoided.
Acciaccatura
A crushed dissonant note of the shortest possible duration played before or after the main note or chord and immediately released - played
A musical ornament (chiefly from the 18 century) of an auxiliary note falling or rising to a harmonised note. There are two possible ways of writing this as you can see from the examples below - played
Turn
An ornament or grace note in which the music ‘turns’ around an original note. i.e. the note itself, the note above the note itself, the note below, with this example using turns and trills.
Mordent
An ornament or grace note consisting of a single rapid alternation of the principal note, a note a semitone lower and the note itself. There is also an inverted mordent.
The principal note, a note a semitone higher and the note itself. Listen to an example from Bach.
Mordent ........................Inverted Mordent
An interval of less than a semitone and used frequently in Eastern music and modern music particularly that of Stockhausen. This example is from Indian Music.
Tritone
An interval of three whole tones or an augmented 4th.
Tone row
The name used to describe the selection of notes chosen by the composer and then used as the basis of a twelve tone composition. This is the tone row for Berg’s violin Concerto of 1935. See inversion, retrograde and Serial music.