Spotify today launched Reserved, a new Premium feature that gives eligible fans access to concert tickets before they go on general sale. Here are the details. Reserved by Spotify launches in the U.S. A few weeks ago, Spotify announced Reserved , a new Premium feature designed to hold up to two concert tickets for some of an artist’s most dedicated fans. Today, the company launched the feature “in partnership with Live Nation, and powered by Ticketmaster,” and it is available to Premium subscribers (who are 18 or older) in the U.S. Here’s Spotify on how Reserved works: “With Reserved, we identify an artist’s most dedicated fans and hold two tour tickets for them to purchase before the general sale goes live.…