I think I have heard that before in another post or 5.
That is the way it is/was and maybe still is. Musicians make music, and would put their recorded music on LP's/CD's/8 Tracks/and cassettes, which is a product, and if you like their music you sometimes buy it. Musicians also sometimes tour, which means they sell tickets, so people can get into the show, which is a product. Many groups have a merch table which has products on it to buy like t-shirts, hats, posters, buttons, cd's and albums.
Is this product thing a new concept?