Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
This link from the Library of Congress- [1] proves it was copyrighted in 1949. Just search the album up.
This link [2] is a search of the Copyright Office's 1978-present records. Nothing was found on this album cover, therefore it's copyright expired before January 1, 1978.
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Uploaded a work by Decca Records, 1949 from https://i.discogs.com/pRJCQqpStAgSdkzpt2v4SYirugC9mNa_kReR7QuUZ_M/rs:fit/g:sm/q:90/h:600/w:600/czM6Ly9kaXNjb2dz/LWRhdGFiYXNlLWlt/YWdlcy9SLTc2OTY1/MDMtMTQ0NjkyOTM3/My0zODA0LmpwZWc.jpeg with UploadWizard