Appoggiatura -

Example : An appoggiatura on a dotted half note takes the value of a half note, leaving the principal note with the remaining quarter note value. 3. Apply Performance Technique

In sheet music, an appoggiatura is written as a placed immediately before a principal (full-sized) note. appoggiatura

Example : An appoggiatura on a quarter note results in two eighth notes. Example : An appoggiatura on a dotted half

The amount of time "stolen" from the principal note depends on the note's original duration and musical style: appoggiatura

which is sometimes referred rather confusingly by Arban ... - Facebook