The term "album," meaning a collection of recorded songs or tunes sold as a unit, has survived right through the era of LPs and CDs, but it previously meant a set of several 78-rpm records. Each record had its own heavy paper sleeve, and the sleeves were bound together along one edge, like the pages of a book, and the whole thing had a cover, like a book—or an album.

People still speak of "sleeve notes" although CDs usually don't have paper sleeves.

Today, when part of a song is repeated, we call it a "chorus," even when only one person sings it, but in old sheet music, you often see that the verse is arranged for one voice while the "chorus" is arranged for several voices singing in harmony. This fits with the older meaning of chorus: a choir.