An arc on a music score is a curved line that connects two or more notes. A SLUR is a curved line that indicates that two or more notes should be played as a single phrase. LENTO is an Italian musical term meaning 'SLOWLY'. Poco is an Italian musical term meaning 'a little'. A CLEF is a symbol placed at the beginning of a staff to indicate the pitch of the notes written on it. A REST is a symbol indicating a period of silence in a piece of music.