As far as I know, a tie is a curved line connecting notes of the same pitch and indicates that the two notes are played as one - i.e. the first note is sounded and then held for the duration of all the notes of the same pitch that are tied.
A rest is used where no notes are sounded, i.e. silence. This can be for all the notes or, where there is more than one musical line, it can indicate a rest on just one or more of the musical lines.
Last edited by JohnB on Mon Jan 01, 2018 3:31 pm, edited 1 time in total.
Hermanos Conde 1968, Stephen Frith 2007 "Guijoso", Christopher Dean 2018, Ana Maria Espinosa 2014