Chevalier Theatre welcomes Loreena McKennitt for her first Medford performance. Well known as a composer and singer over a recording career spanning more than two decades, McKennitt’s “eclectic Celtic” music has received critical acclaim world-wide, and gold, platinum and multi-platinum sales awards in 15 countries across four continents. To date, she has sold over 14 million albums with a catalog that includes seven studio recordings, three seasonal recordings, a live in-concert DVD and two DVD documentaries. She’s won two Junos, Canada’s premier music award, garnered two Grammy nominations, and has performed for Her Majesty Queen Elizabeth II. Tickets are $50 to $89 through the Chevalier Theatre website/Ticketmaster. Tickets also may be purchased, free of online ordering fees, at the Chevalier Theatre Box Office, which is open on Fridays and Saturdays from noon to 6 p.m., as well as two hours before every Chevalier Theatre show.