There are three sets of rights potentially in play. Perfomers' rights (in relation to recordings and broadcasts of performances) as per the Rome convention of 1960. Noting the date of death as 1949 it would take a bit of checking of transitional provisions to see if the relevant rights still subsisted in Rome Convention countries. There are some anomalously long periods of protection in some circumstances, and if mymemory serves me there were stil some jurisdictions not long ago where the rights in the recordings of the Irish Tenor Count John McCormack still existed, but I may be thinking of rights in the recordings not the rights in the performances. The USA is not a Rome convention country and rights of this nature do not exist there. If such rights now exist in the UK it will be under part III of the Copyright Designs and Patents Act 1988 and without checking I think they are limited to 50 years after the date of death so these rights are likely to have expired.
Then there are rights of copyright or neighbouring rights (it's a European distinction, don't ask) in the recordings themselves. These are not likely still to subsist, in that the general rule is that they last for 50 years from the making of the recording. THere are exceptions.
FInally there is the copyright in the words and music of the osngs. Generally these will subsist until 50 or 70 years from the date of death of the respective authors, and until the 31st December of the respective year. But under US law any relavant rights must have needed renewing 28 years after the first term started, and will have expired after another 28 years if renewed (possibly in different ownership) - but the second 28 year period got extended while teh USA was thinking about jining the Berne convention adn if the relevant rights stil lsubsited in teh respective country of origin (probably England and Wales) when the US Berne COnvention Implementation Act was passed, the rights are likely to have been revived in teh USA. So-called "reliance parties" may have a privileged position in relation to the revived rights. US law now contains a "termination privilege" and it may ahve been possible for the rights to ahve been brought back from any long term assignemnt or licence.
In England, an assignemnt made by an author before 1957 will ahve ceased to ahve effect and the rights reverted to the author's estate 25 years after his death (ie 1974), unless the estate confirmed the alienation. Australian position might be similar.