Vorschlag, der; -(e)s, Vorschläge [...] 2. Mus. Ton, der dem Hauptton als Verzierung vorausgeht: ein langer, kurzer V.http://m-w.com/dictionary/appoggiatura
Main Entry: ap·pog·gia·tu·ra
Etymology: Italian, literally, support
: an embellishing note or tone preceding an essential melodic note or tone and usually written as a note of smaller size http://m-w.com/dictionary/acciaccatura
Main Entry: ac·ciac·ca·tu·ra
Etymology: Italian, literally, crushing
Date: circa 1819
a discordant note sounded with a principal note or chord and immediately releasedhttp://lilypond.org/doc/v2.10/Documentation/u...
Grace notes are ornaments that are written out. The most common ones are acciaccatura, which should be played as very short. It is denoted by a slurred small note with a slashed stem. The appoggiatura is a grace note that takes a fixed fraction of the main note, and is denoted as a slurred note in small print without a slash. They are entered with the commands \acciaccatura and \appoggiatura [...]http://en.wikipedia.org/wiki/Appoggiatura#App...
From the Italian word appoggiare, "to lean upon"; (approximate IPA pronunciation [əˌpʰodʒə̆ˈtuˑɾə]). The long appoggiatura is important melodically and often suspends the principal note by taking away the time-value of the appoggiatura prefixed to it (generally half the time value of the note, though in triple time, for example, it might receive two thirds of the time). The added note (the unessential note) is one degree higher or lower than the principal note; and, if lower, it may or may not be chromatically raised (see mordent).
The appoggiatura is written as a grace note prefixed to a principal note and printed in small character, usually without the oblique stroke
Musicians' mnemonic: the appoggiatura is longer than the acciaccatura because it is podgy.
From the Italian word acciaccare, "to crush"; (approximate IPA pronunciation [əˌtʃækə̆ˈtuˑɾə]). The acciaccatura (sometimes called short appoggiatura) is perhaps best thought of as a shorter, less melodically significant, variant of the long appoggiatura, where the delay of the principal note is scarcely perceptible – theoretically subtracting no time at all. It is written using a grace note (often a quaver, or eighth note), with an oblique stroke through the stem
Whether the note should be played before or on the beat is largely a question of taste and performance practice. Exceptionally, the acciaccatura may be notated in the bar preceding the note to which it is attached, showing that it is to be played before the beat. (This guide to practice is unfortunately not available, of course, if the principal note does not fall at the beginning of the measure.)
In some cases on instruments that permit it, such as the piano, the acciaccatura is sounded simultaneously with the principal note, and then immediately released.