If the note to be dotted is on a space, the dot also goes on the space, while if the note is on a line, the dot goes on the space above (this also goes for notes on ledger lines).
Theoretically, any note value can be dotted, as can rests of any value. If the rest is in its normal position, are always placed in third staff space from the bottom,
Dots can be used across barlines, such as in H. C. Robbins Landon's edition of Joseph Haydn's Symphony No. 70 in D major, but most writers today regard this usage as "obsolete" and recommend using a tie across the barline instead.
More than one dot may be added; each dot adds half of the duration added by the previous dot, as shown in example 1.
The double-dotted note is used less frequently than the dotted note. Typically, as in the example below, it is followed by a note whose duration is one-quarter the length of the basic note value, completing the next higher note value.
In a French overture (and sometimes other Baroque music), notes written as dotted notes are often interpreted to mean double-dotted notes, and the following note is commensurately shortened; see authentic performance.
An example of the use of double- and triple-dotted notes is the Prelude in G Major for piano, op. 28 No. 3, by Frédéric Chopin. The piece, in common time (4/4), contains running semiquavers in the left hand. Several times during the piece Chopin asks for the right hand to play a triple-dotted minim (lasting 15 semiquavers) simultaneously with the first left-hand semiquaver, then one semiquaver simultaneously with the 16th left-hand semiquaver.
This makes it clear that continuous dotting does give a continuous prolongation of the original note, but it will never get as long as twice the original value.
Protecting St. Croix Valley Nature; PURPLE PASSION; Conservationists Have Rallied to Save the Endangered Dotted Blazing Star from the Path of the New St. Croix River Bridge. Next Spring, a Handful of Plants Will Multiply into Hundreds, Possibly Thousands. Conservationists Rally to Save Dotted Blazing Star near Bridge
Dec 23, 2012; Byline: KEVIN GILES; STAFF WRITER Because of a new St. Croix River bridge, an 8,000-year-old purple prairie plant will be saved...