The term 'Auld Lang Syne' is a traditional Scottish poem written by Robert Burns in 1788. It is often sung at the end of the year to celebrate the passing of time and the memories of the PAST. The crossword solutions for this term are AULD (4 letters), YESTERDAY (9 letters), PAST (4 letters) and YORE (4 letters). These words all refer to the idea of nostalgia and remembering the PAST, which is the main theme of the poem.