Ledger Line
See Leger Line.
Legato (It.) (leh-gah'-to), Legando (It.) (leh-gan'-do) [from legare, to tie or bind].
Passages thus marked are to be played with smoothness, without any break between the tones. Legatissimo, as smooth as possible, the tones slightly overlapping. Legato is indicated by this sign called a slur.
The proper observance of Legato is of the utmost importance in phrasing.