Caddam Woods was written by Adam Rennie & John Y Cameron. Adam died in 1960, ( see: http://www.raretunes.org/performers/adam-rennie) so under the 70 year rule, it is copyright until 2030 - to someone, probably a family member unless assigned otherwise.

Whilst most traditional performers/composers' families are extremely happy for their tunes to be popularised by any method, a few are a bit more precious about their (perfectly legitimate) rights, and get hurt if permission is not sought.
Rarely is any money requested; a simple letter and maybe a copy of the publication satisfies most copyright holders.

Paws