Copyright ends 50 years following the last day of the year that the authour died. With a name like Newfiegirl I am assuming that you are in Canada on that big rock of the coast of Cape Breton. :-}
In the USA it is different and I think quite a bit longer.
A lot depends as well what you intend to do with the songs as well. If a copyright is held in another country you may have to abide by its laws if you intend to sell the book there. Even if not international treaties may come into play but they would be almost un-enforcible on a small scale distribution because the royalty that you would be liable for would be small as well. If something is still in copyright and has not been published you would need the authour's permission. If it has been released in publication then you would be required to pay a royalty to the copyright holder. This could be other than the authour of the work.
There is also fair use provisions that may exempt you for certain reasons.
"Newfiegirl, I am not a lawyer so take what I say as only advisory in nature"