Start with a document you can inspect.
Tom Lehrer’s song archive publishes his copyright declaration and song documents. On 52lyrics, each complete Lehrer text links to the particular PDF used for that reading page. Open The Elements or Be Prepared, then follow the source link below the text. The displayed stanzas were checked against the author’s document rather than accepted from extracted PDF text alone.
Keep the lyric sheet and recording distinct.
The source sheet tells you which words this page presents. It does not establish every spoken introduction, lyric change, or running time in a performance. A song can also appear on multiple release editions; the album link on each page identifies its catalog placement. Texts without a verified recording placement appear in Tom Lehrer: Author Lyric Sheets, an editorial reading selection rather than a historical album.
Check the scope of the rights statement.
Lehrer’s declaration covers lyrics and music he wrote or composed. It does not establish rights in third-party photographs, album art, or an underlying work written by someone else. Where a text adapts another writer’s work, the lyric page links separate evidence for that original. Check the source block before reusing a text; the displayed edition and the recording or artwork can have different rights.