In music, the tie is a curved line joining two (or more) notes of the same pitch, where the second note(s) is not played, but its time value is added to that of the first note.
In Example Two, the first note is held for seven counts.
A tie is necessary if a note is played over a bar line, as in Example Two above, and in the 2 bar riff below.
In tablature notation the curved line of a tie is not necessary.
Lick 71 uses a tie within the bar.