Thanks to my Uncle Pops whom has helped with the direction.
PRS – a lovely gentleman whom founded the mind, body & spirit magazine (and then was bought out because was making a loss due to his good heart I feel) advised me that music copyrights expire 7 years after composition/release. However there must be a bit more out there to know about little factors as there always is.
The Berne Convention classified copyright as a worldwide treaty in 1886.
Link from Uncle Pops = www.copyrightsworld.com)….. tbc