On the Using a [Class as a Type](https://www.totaltypescript.com/books/total-typescript-essentials/classes#using-a-class-as-a-type) section, there is an example to use it. `printAlbumInfo(sixtyNineLoveSongsAlbum);` But the class name "`sixtyNineLoveSongsAlbum`" doesn't exist. I think it can be changed with "`loopFindingJazzRecords`". Thanks for the creating the TypeScript book.