Albums and playlists are not themselves pieces, but collections of pieces. Passage is a generic term for a portion of a song across the time domain, and part is

Albums and playlists are not themselves pieces, but collections of pieces. Passage is a generic term for a portion of a song across the time domain, and part is the term for what one performer is contributing among many. Analogy: "image" is like "piece of music" in that it is a general term that divides into photo, graphic, and more. A photo album is not an image, it is a collection of images (specifically photos). And across art more generally, "piece" could be a unit of music, image, sculpture, or others. A piece is a unit. Like a SKU. Like a chocolate bar with a barcode on it (piece of music), which arrives in a carton of many bars (album or playlist) and can also be broken along scored subdivisions (verses or movements). Some bars are milk chocolate (song), others are dark chocolate (concerto), and plenty of other varieties as well. Don't clap between movements, only at the end of the piece. Is "hoover" a genericized trademark used to refer to many other vacuum cleaners because "vacuum cleaner" is more cumbersome to say in casual conversation? Yes. Is it useful to point that out in an analysis of different vacuum cleaners? Yes.