Re: is it slur or tie
Reply #1 –
Hi Frank,
TIE:
a tie is flatter, or not so curvy, and will only go from notehead to notehead. It will span from AFTER the first notehead to BEFORE the second notehead, and both ends will be close to, and on the same level as the horizontal centreline of the noteheads.
It will never span multiple noteheads. The notes MUST be the same pitch and notes tied over a barline will be the same pitch even if the first note has an accidental and the second does not (this is normal, dare I say "correct", engraving practice). The second note will almost never be articulated (there are some odd exceptions to this but generally no articulations is the norm).
SLUR:
A slur has a very variable curve, normally "higher" than a tie and need not start or finish* at a notehead, but can extend to or from a position along the stem, or even the end of the stem, and it can span many noteheads if required.
If the slur starts or finishes at a notehead it should be in line with the vertical centreline of the notehead. The notes included in the slur may or may not be the same pitch.
They will also be articulated. Normally the articulation will be a soft legato style, but this is not necessarily always the case. The important thing is that there is no** cessation of sound between slurred notes. An exception to this is slurred staccato notes: in this case the notes are separated but not as much as a normal staccato. Or at least that's one interpretation... Somewhat similar to staccato and tenuto on the same note: separate the notes but not quite as much and "lean" on them a little...
* Strangely enough, though it breaks accepted engraving practice, a slur can also start or finish at a rest, or even in empty space. A tie cannot do this.
A slur ending on a rest or in space is called a "let ring" slur. Starting a slur like this is extremely uncommon and I only recall seeing it in a very few jazz charts. It is my interpretation that such a slur implies an indefinite starting time for the note.
**Slurs are often used to define phrasing. In this case it is not important to avoid a cessation of sound, but any gaps should not imply a new phrase. This is an exercise for the musician
Further discussion:
A slur can span tied notes, but a tie cannot span slurred notes. If a slur includes tied notes at the start or end of a passage then it is good engraving practice to include both tied notes within the slur. E.G. if the end of a slurred passage has tied notes then do not end the slur on the first note of the tied pair, end it on the last one.
Slurs and ties should NEVER cross stems.
That's probably way more than you're asking... My "keyboard diarrhoea" has struck again