Sheet music available here: tamsindearnley.co.uk/sheetmusic/?id=aud-lang-syne
This well-known song is often associated with Hogmanay celebrations, but it is also used at many other times of the year, and is a popular way to close a Ceilidh in Scotland.
The famous lyrics are by Robert Burns, but there are two melodies to which they can be sung. This arrangement combines both the original (yet less well-known) melody with the one more commonly used today. The two tunes are very similar though, so I've marked on the video where the different ones are used!