Canadian singer/instrumentalist Loreena McKennitt will begin a North American tour April 15 in Toronto, her first since 1998. It follows a previously announced 21-date European tour that begins March 11 in Stuttgart, Germany, and finishes April 6 in Antwerp, Belgium.

The roadwork comes in support of McKennitt's Verve/Quinlan Road debut, "An Ancient Muse," which has sold more than 500,000 units worldwide since its late November release.

Meanwhile, PBS in the United States will air "Loreena McKennitt: Nights From The Alhambra" on its "Great Performances" series during March. The program was filmed over two nights in September 2006 at the Alhambra, the historic monument and Unesco World Heritage site in Granada, Spain.

Here are Loreena McKennitt's tour dates:

April 15-16: Toronto (Massey Hall)
April 17: Montreal (Place des Arts)
April 19: Philadelphia (Academy of Music)
April 20: New York (Radio City Music Hall)
April 21: Boston (Wang Centre)
April 23: Reading, Pa. (Sovereign Center)
April 24: Washington, D.C. (DAR Constitution Hall)
April 26: Asheville, N.C. (Thomas Wolfe Auditorium)
April 27: Nashville (Ryman Auditorium)
April 29: Ann Arbor, Mich. (Michigan Theater)
May 1: Chicago (Civic Opera House)
May 2: Madison, Wis. (Overture Hall)
May 3: Minneapolis (Orpheum Theatre)
May 5: Boulder, Colo. (Macky Auditorium)
May 7: Salt Lake City (Kingsbury Hall)
May 9: Scottsdale, Ariz. (Symphony Hall)
May 10: Los Angeles (Greek Theatre)
May 11: San Diego (Humphrey's)
May 12: Oakland, Calif. (Paramount Theatre)
May 13: San Rafael, Calif. (Marin Civic Theatre)
May 15: Seattle (Paramount Theatre)
May 16: Bellingham, Wash. (Mt. Baker Theatre)
May 18-19: Victoria, B.C. (Royal Theatre)