Today is National Record Store Day. Music sellers throughout the country are celebrating in a variety of ways, from special sales and promotions to instore performances. Given the challenges that have faced “brick and mortar” record stores in recent years – internet retailers, digital downloading, and plummeting CD sales among them – I’m glad there’s a day to celebrate with the people who’ve helped me find many musical treasures. To find out if your local retailer is participating, visit www.recordstoreday.com.