Include any collection you want, but especially in cases where the artist recorded in a period that pre-dates the album era; technology (12 inch record going 33.3 rpm) introduced in the 50s established a framework that at some point in the 60s came to define what an album is (12 songs , 45 to 60 minutes long). A definition that, by the way, again because of new technology, pop music in the process of abandoning, if we haven’t already.