Harmony House
... that defunct Detroit-based music retailer Harmony House began in 1947 as a Hallmark Cards store?
... that defunct <a href="./Detroit" id="mwBvw" rel="mw:WikiLink" title="Detroit">Detroit</a>-based music retailer <b id="mwBv0"><a href="./Harmony_House" id="mwBv4" rel="mw:WikiLink" title="Harmony House">Harmony House</a></b> began in 1947 as a <a href="./Hallmark_Cards" id="mwBv8" rel="mw:WikiLink" title="Hallmark Cards">Hallmark Cards</a> store?