Here's why:
* It represents a group of individual items: An album is a collection of songs, photographs, or other items.
* It can be used in singular form even when referring to multiple things: You might say "The album is amazing" even though the album contains several songs.
However, it's important to note that "album" is not always a collective noun. It can also be used as a singular noun referring to a single object, such as "I bought a new album today."
Therefore, whether "album" is a collective noun depends on the context and how it's used in a sentence.