I believe that one of the reasons fans like to collect music products is that they provide proof that they are fans of their favourite artists’ work.
My current manifestation of this is a feature I’ve added to Songcards where the names of those who hold a given Songcard are featured in the card view.
The idea here is that fans will show off to their friends that they have added this card to their collection, which is then reinforced by the presence of the card as listed on their collector’s page.
How do you like to express your support and fandom of your favourite artists?