In music notation, a tie is a curved line connecting the heads of two notes of the same pitch, indicating that they are to be played as a single note with a duration equal to the sum of the individual notes' values. A tie is similar in appearance to a slur; however, slurs join notes of different pitches which need to be played independently, but seamlessly (legato).
A tie is a curved line above or below two notes of the same pitch, which indicates that they are to be performed like one note equal in length to the two.
A writer in 1901, said that the following definition is preferable to the previous:
A tie is a curved line connecting two notes of the same pitch, to show that the second is a continuation of the first.
Ties...are a notational device used to show the prolongation of a note into succeeding beats, as opposed to a repetition of a note. ... Our modern tie-mark, first systematically used in the early sixteenth century [Baroque music], is a curved line that connects the two successive note-heads indicating, together, the total time value desired. ... Ties are normally employed to join the time-value of two notes of identical pitch.
The tie is a curved line that connects two adjacent notes of the same pitch into a single sound with a duration equal to the sum of both note values.
The duration of a note can be prolonged...using a tie to the one note over to another of the same pitch....A tie adds to the time value of the first note the value of the succeeding note or notes that are paired together by the tie or ties.
A tie is a curved line connecting two notes of the same pitch, thereby creating a durational value equal to the sum of the values of the note notes. This is necessary when a note is to be sustained over a bar line, and under certain conditions, within the same measure.[a]
The tie shown at the top right connects a quarter note (crotchet) to a sixteenth note (semiquaver), creating a note 5⁄4 as long as a quarter note, or five times as long as a sixteenth note—there is no single note value to express this duration. However, in some cases one might tie two notes that could be written with a single note value, such as a quarter note tied to an eighth note (the same length as a dotted quarter). This might be because:
- A barline is between the notes
- The second note begins a metric grouping, falling on a stressed beat of the meter. This change in notation (choosing the tie rather than the longer note value) does not affect performance, but it makes the music easier to read. Sometimes it can be used to make it clear that it has the appropriate rhythm. For example, a 6
8 measure with three equal notes would have a quarter note on each side but two tied eighth notes in the middle; a 3
4 measure with three equal notes would have all quarter notes.
Several notes in succession can be tied together. Such a succession can also be part of a larger, slurred phrase, in which case, ties and slurs must be used simultaneously and distinguishably.
The tie first appeared in 1523 in the Recerchari, motetti, canzoni by Marco Antonio Cavazzoni. The tie was used to show the duration of differing harmonies on early figured basses to show how they should be sounded over the held bass note. Many early pianists, like Beethoven, used the tie in many pieces to show the demand of gentle reiteration. 
- McLaughlin, James M. (1902). Elements and Notation of Music. Boston Ginn & Co. Quoted in Music: A Monthly Magazine (1901), p.355.
- (1901). Music: A Monthly Magazine, Devoted to the Art, Science, Technic and Literature of Music, Volumes 20-21, p.355. W.S.B. Mathews.
- Read, Gardner (1969). Music Notation, p.110. Cresendo, Taplinger: New York. ISBN 0-8008-5453-5.
- Benward & Saker (2003). Music: In Theory and Practice, Vol. I, p.8. Seventh Edition. ISBN 978-0-07-294262-0.
- Castellini, John (1962). Rudiments of Music, p.51-2. W.W. Norton. [ISBN unspecified].
- Sorce, Richard (1995). Music Theory for the Music Professional, p.11. Scarecrow Press. ISBN 9781880157206.
- Rastall, Richard. "Tie". Grove Music Online. Oxford Music Online. Retrieved 15 April 2020.
- Ties Explained – A simple explanation of tied notes
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